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S’mores Cookie Bars Irresistible and Simple Treat

by on May 17, 2025

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Craving a sweet treat that’s both simple and delicious? Let me introduce you to S’mores Cookie Bars! These bars pack all the gooey goodness of classic s’mores into every bite. With a rich cookie base, melty chocolate, and mini marshmallows, you’ll make a batch that disappears fast. Follow my easy guide and discover how to create this mouthwatering dessert that’s sure to impress friends and family alike!

- 1 ½ cups all-purpose flour - ½ teaspoon baking soda - ½ teaspoon salt - ½ cup unsalted butter, softened - ½ cup packed brown sugar - ½ cup granulated sugar - 1 large egg - 1 teaspoon pure vanilla extract - 1 cup semi-sweet chocolate chips - 1 cup mini marshmallows - 1 cup graham cracker crumbs For those who prefer different measurements, here's how to convert: - 1 ½ cups = 360 mL - ½ teaspoon = 2.5 mL - 1 cup = 240 mL - ½ cup = 120 mL - 1 large egg = about 50 grams - 1 teaspoon = 5 mL You can easily swap some ingredients if you like. Here are some ideas: - Use coconut oil instead of butter for a dairy-free option. - Replace granulated sugar with coconut sugar for a richer flavor. - Try using almond flour instead of all-purpose flour for a gluten-free treat. - If you want a different flavor, use white chocolate chips instead of semi-sweet. - You can use regular marshmallows instead of mini ones, just cut them into smaller pieces. {{ingredient_image_2}} Start by preheating your oven to 350°F (175°C). You want a warm oven to bake these bars. Next, grab a 9x9-inch baking pan. Lightly grease it or line it with parchment paper. This helps the bars come out easily after baking. In a medium bowl, add 1 ½ cups of all-purpose flour, ½ teaspoon of baking soda, and ½ teaspoon of salt. Whisk these dry ingredients together until they mix well. This step is key for even baking. In a large mixing bowl, take ½ cup of softened unsalted butter. Add ½ cup of packed brown sugar and ½ cup of granulated sugar. Use an electric mixer on medium speed. Mix for about 2 to 3 minutes. The mixture should become light and fluffy. Now, add 1 large egg and 1 teaspoon of pure vanilla extract to the butter-sugar mix. Blend these together until everything is smooth. This will make the batter rich and tasty. Gradually mix the dry flour mixture into the wet ingredients. Stir until just combined. Be careful not to overmix, as it can make the bars dense. You want a nice, soft batter. Next, gently fold in 1 cup of semi-sweet chocolate chips and 1 cup of graham cracker crumbs using a spatula. Keep a handful of each for topping. Spread half of the cookie batter into the prepared baking pan. Press it down evenly for a solid base. Sprinkle 1 cup of mini marshmallows evenly on the first layer of cookie batter. Top this with your reserved chocolate chips and graham cracker crumbs. Carefully spoon the rest of the cookie batter over the marshmallow layer, covering it as much as you can. Place the pan in the oven and bake for 25-30 minutes. The edges should be golden brown. The center should feel set when you touch it. Once baked, take the pan out of the oven. Let the bars cool completely in the pan. This step helps them hold their shape when you cut them. Slice into squares or rectangles to serve. For a fun touch, add more mini marshmallows and chocolate chips on top. Enjoy them warm or with a scoop of vanilla ice cream! To get the best texture in your S’mores cookie bars, use soft butter. This helps create a nice, fluffy mix. Do not overmix the batter after adding the flour. This keeps your bars light and chewy. The right balance of chocolate, marshmallows, and graham crumbs makes each bite special. Also, let the bars cool completely before slicing. This helps them hold their shape. Baking time is key. Set your timer for 25 minutes first. Check the edges; they should be golden brown. The center should feel set but not hard. If your oven runs hot, check them a bit earlier. Use a toothpick; if it comes out clean, your bars are ready. Keep an eye on them to avoid overbaking. Overbaking makes them dry and crumbly, not chewy. For a fun touch, serve the warm bars with extra mini marshmallows and chocolate chips on top. This adds a nice look and extra flavor. You can also pair them with a scoop of vanilla ice cream. The cold ice cream melts into the warm bars, creating a delicious mix. If you want to impress guests, cut the bars into fun shapes using cookie cutters. Pro Tips Chill the Dough: If you have time, chill the cookie dough for about 30 minutes before baking. This helps the bars maintain their shape and prevents them from spreading too much in the oven. Use Fresh Ingredients: Always opt for fresh marshmallows and chocolate chips for the best flavor and texture. Stale ingredients can affect the overall taste of your bars. Check for Doneness: To ensure your bars are perfectly baked, use a toothpick to check the center. It should come out with a few moist crumbs, but not wet batter. Layering Technique: When layering, make sure to spread the top layer gently to avoid disturbing the marshmallows and chocolate chips underneath. This keeps all the deliciousness intact! {{image_4}} You can switch up the chocolate to suit your taste. Use dark chocolate or milk chocolate chips instead of semi-sweet. For a fun twist, try white chocolate chips or even a mix of chocolates. Each type adds a new layer of flavor, making your S’mores cookie bars special. If you want to cut sugar, use honey or maple syrup. These options give a different sweetness and can add unique flavors. You can also try coconut sugar for a more natural choice. Just remember to adjust the wet ingredients since liquid sweeteners change the batter's texture. Adding nuts or fruits can give your bars a tasty crunch. Try chopped walnuts, pecans, or almonds for a nutty flavor. For fruit, you can add dried cherries or cranberries. These additions will enhance the texture and offer new flavors, making your bars truly unique. To make gluten-free S’mores cookie bars, just swap the all-purpose flour for a gluten-free blend. Many blends work well in cookie recipes. Ensure that your graham cracker crumbs are also gluten-free. This way, everyone can enjoy these delicious treats without worry. To keep your S’mores Cookie Bars fresh, store them in an airtight container. This helps maintain their soft texture. Place a layer of parchment paper between layers if you stack them. They stay fresh at room temperature for up to five days. If you want them to last longer, refrigerate them. They can stay good for about a week in the fridge. You can freeze S’mores Cookie Bars for later. First, let them cool completely. Then, cut them into squares. Wrap each square tightly in plastic wrap. Place the wrapped bars in a freezer-safe bag or container. They can last up to three months in the freezer. When you’re ready to enjoy them, just thaw them in the fridge overnight. To enjoy your S’mores Cookie Bars warm, preheat your oven to 350°F (175°C). Place the bars on a baking sheet. Cover them lightly with foil to keep them moist. Heat for about 10 minutes. You can also microwave them. Just place one bar on a plate and heat for 10 to 15 seconds. Enjoy that gooey goodness! You can tell when the bars are done by checking the edges. They should look golden brown. The center should feel set but not too firm. If you gently press the center, it should spring back slightly. This process usually takes about 25 to 30 minutes in the oven. Yes, you can use any type of graham crackers you like. Honey, cinnamon, or even chocolate-flavored ones work great. The taste will change a bit, but that adds fun to your recipe. Just crush them to make crumbs before mixing. To make them vegan, replace the butter with vegan butter. Use a flax egg instead of a regular egg. Mix one tablespoon of ground flaxseed with three tablespoons of water. Let it sit for five minutes to thicken. You can also choose dairy-free chocolate chips for a complete vegan treat. These bars taste great on their own, but you can add more fun. Serve them warm with a scoop of vanilla ice cream. A drizzle of chocolate sauce or a sprinkle of extra mini marshmallows also adds a nice touch. You can even pair them with a glass of milk for a classic combo. You learned how to make tasty S’mores Cookie Bars from scratch. We covered key ingredients, step-by-step mixing, and baking tips. Remember to experiment with different chocolates and toppings for fun flavors. Store them well, and they’ll stay fresh. Making these bars should be enjoyable and easy. Get creative and share your cookies with friends! Enjoy every bite of your delicious creation!

Why I Love This Recipe

  1. Delicious Flavor Combination: The perfect blend of chocolate, marshmallows, and graham crackers creates a nostalgic treat reminiscent of campfire s’mores.
  2. Easy to Make: This recipe comes together quickly, requiring minimal prep time and simple ingredients, making it perfect for novice bakers.
  3. Customizable: Feel free to add nuts, different types of chocolate, or even fruit to personalize these bars to your liking.
  4. Great for Sharing: With 16 servings, these cookie bars are ideal for parties, picnics, or family gatherings, allowing everyone to enjoy a sweet treat.

Ingredients

List of Ingredients

– 1 ½ cups all-purpose flour

– ½ teaspoon baking soda

– ½ teaspoon salt

– ½ cup unsalted butter, softened

– ½ cup packed brown sugar

– ½ cup granulated sugar

– 1 large egg

– 1 teaspoon pure vanilla extract

– 1 cup semi-sweet chocolate chips

– 1 cup mini marshmallows

– 1 cup graham cracker crumbs

Measurement Conversions

For those who prefer different measurements, here’s how to convert:

– 1 ½ cups = 360 mL

– ½ teaspoon = 2.5 mL

– 1 cup = 240 mL

– ½ cup = 120 mL

– 1 large egg = about 50 grams

– 1 teaspoon = 5 mL

Ingredient Substitutions

You can easily swap some ingredients if you like. Here are some ideas:

– Use coconut oil instead of butter for a dairy-free option.

– Replace granulated sugar with coconut sugar for a richer flavor.

– Try using almond flour instead of all-purpose flour for a gluten-free treat.

– If you want a different flavor, use white chocolate chips instead of semi-sweet.

– You can use regular marshmallows instead of mini ones, just cut them into smaller pieces.

Step-by-Step Instructions

Prepping the Baking Pan

Start by preheating your oven to 350°F (175°C). You want a warm oven to bake these bars. Next, grab a 9×9-inch baking pan. Lightly grease it or line it with parchment paper. This helps the bars come out easily after baking.

Mixing Dry Ingredients

In a medium bowl, add 1 ½ cups of all-purpose flour, ½ teaspoon of baking soda, and ½ teaspoon of salt. Whisk these dry ingredients together until they mix well. This step is key for even baking.

Creaming the Butter and Sugars

In a large mixing bowl, take ½ cup of softened unsalted butter. Add ½ cup of packed brown sugar and ½ cup of granulated sugar. Use an electric mixer on medium speed. Mix for about 2 to 3 minutes. The mixture should become light and fluffy.

Combining Wet Ingredients

Now, add 1 large egg and 1 teaspoon of pure vanilla extract to the butter-sugar mix. Blend these together until everything is smooth. This will make the batter rich and tasty.

Forming the Cookie Batter

Gradually mix the dry flour mixture into the wet ingredients. Stir until just combined. Be careful not to overmix, as it can make the bars dense. You want a nice, soft batter.

Layering the Ingredients

Next, gently fold in 1 cup of semi-sweet chocolate chips and 1 cup of graham cracker crumbs using a spatula. Keep a handful of each for topping. Spread half of the cookie batter into the prepared baking pan. Press it down evenly for a solid base.

Baking the Cookie Bars

Sprinkle 1 cup of mini marshmallows evenly on the first layer of cookie batter. Top this with your reserved chocolate chips and graham cracker crumbs. Carefully spoon the rest of the cookie batter over the marshmallow layer, covering it as much as you can.

Place the pan in the oven and bake for 25-30 minutes. The edges should be golden brown. The center should feel set when you touch it.

Cooling and Serving Suggestions

Once baked, take the pan out of the oven. Let the bars cool completely in the pan. This step helps them hold their shape when you cut them. Slice into squares or rectangles to serve. For a fun touch, add more mini marshmallows and chocolate chips on top. Enjoy them warm or with a scoop of vanilla ice cream!

Tips & Tricks

Perfecting the Texture

To get the best texture in your S’mores cookie bars, use soft butter. This helps create a nice, fluffy mix. Do not overmix the batter after adding the flour. This keeps your bars light and chewy. The right balance of chocolate, marshmallows, and graham crumbs makes each bite special. Also, let the bars cool completely before slicing. This helps them hold their shape.

Baking Tips for Chewy Bars

Baking time is key. Set your timer for 25 minutes first. Check the edges; they should be golden brown. The center should feel set but not hard. If your oven runs hot, check them a bit earlier. Use a toothpick; if it comes out clean, your bars are ready. Keep an eye on them to avoid overbaking. Overbaking makes them dry and crumbly, not chewy.

Serving and Presentation Suggestions

For a fun touch, serve the warm bars with extra mini marshmallows and chocolate chips on top. This adds a nice look and extra flavor. You can also pair them with a scoop of vanilla ice cream. The cold ice cream melts into the warm bars, creating a delicious mix. If you want to impress guests, cut the bars into fun shapes using cookie cutters.

Pro Tips

  1. Chill the Dough: If you have time, chill the cookie dough for about 30 minutes before baking. This helps the bars maintain their shape and prevents them from spreading too much in the oven.
  2. Use Fresh Ingredients: Always opt for fresh marshmallows and chocolate chips for the best flavor and texture. Stale ingredients can affect the overall taste of your bars.
  3. Check for Doneness: To ensure your bars are perfectly baked, use a toothpick to check the center. It should come out with a few moist crumbs, but not wet batter.
  4. Layering Technique: When layering, make sure to spread the top layer gently to avoid disturbing the marshmallows and chocolate chips underneath. This keeps all the deliciousness intact!

Variations

Adding Different Chocolate Types

You can switch up the chocolate to suit your taste. Use dark chocolate or milk chocolate chips instead of semi-sweet. For a fun twist, try white chocolate chips or even a mix of chocolates. Each type adds a new layer of flavor, making your S’mores cookie bars special.

Using Alternative Sweeteners

If you want to cut sugar, use honey or maple syrup. These options give a different sweetness and can add unique flavors. You can also try coconut sugar for a more natural choice. Just remember to adjust the wet ingredients since liquid sweeteners change the batter’s texture.

Customizing with Nuts or Fruits

Adding nuts or fruits can give your bars a tasty crunch. Try chopped walnuts, pecans, or almonds for a nutty flavor. For fruit, you can add dried cherries or cranberries. These additions will enhance the texture and offer new flavors, making your bars truly unique.

Making it Gluten-Free

To make gluten-free S’mores cookie bars, just swap the all-purpose flour for a gluten-free blend. Many blends work well in cookie recipes. Ensure that your graham cracker crumbs are also gluten-free. This way, everyone can enjoy these delicious treats without worry.

Storage Info

Best Ways to Store S’mores Cookie Bars

To keep your S’mores Cookie Bars fresh, store them in an airtight container. This helps maintain their soft texture. Place a layer of parchment paper between layers if you stack them. They stay fresh at room temperature for up to five days. If you want them to last longer, refrigerate them. They can stay good for about a week in the fridge.

Freezing Instructions

You can freeze S’mores Cookie Bars for later. First, let them cool completely. Then, cut them into squares. Wrap each square tightly in plastic wrap. Place the wrapped bars in a freezer-safe bag or container. They can last up to three months in the freezer. When you’re ready to enjoy them, just thaw them in the fridge overnight.

How to Reheat for Freshness

To enjoy your S’mores Cookie Bars warm, preheat your oven to 350°F (175°C). Place the bars on a baking sheet. Cover them lightly with foil to keep them moist. Heat for about 10 minutes. You can also microwave them. Just place one bar on a plate and heat for 10 to 15 seconds. Enjoy that gooey goodness!

FAQs

How do I know when S’mores Cookie Bars are done?

You can tell when the bars are done by checking the edges. They should look golden brown. The center should feel set but not too firm. If you gently press the center, it should spring back slightly. This process usually takes about 25 to 30 minutes in the oven.

Can I use different types of graham crackers?

Yes, you can use any type of graham crackers you like. Honey, cinnamon, or even chocolate-flavored ones work great. The taste will change a bit, but that adds fun to your recipe. Just crush them to make crumbs before mixing.

How can I make S’mores Cookie Bars vegan?

To make them vegan, replace the butter with vegan butter. Use a flax egg instead of a regular egg. Mix one tablespoon of ground flaxseed with three tablespoons of water. Let it sit for five minutes to thicken. You can also choose dairy-free chocolate chips for a complete vegan treat.

What can I serve with S’mores Cookie Bars?

These bars taste great on their own, but you can add more fun. Serve them warm with a scoop of vanilla ice cream. A drizzle of chocolate sauce or a sprinkle of extra mini marshmallows also adds a nice touch. You can even pair them with a glass of milk for a classic combo.

You learned how to make tasty S’mores Cookie Bars from scratch. We covered key ingredients, step-by-step mixing, and baking tips. Remember to experiment with different chocolates and toppings for fun flavors. Store them well, and they’ll stay fresh. Making these bars should be enjoyable and easy. Get creative and share your cookies with friends! Enjoy every bite of your delicious creatio

- 1 ½ cups all-purpose flour - ½ teaspoon baking soda - ½ teaspoon salt - ½ cup unsalted butter, softened - ½ cup packed brown sugar - ½ cup granulated sugar - 1 large egg - 1 teaspoon pure vanilla extract - 1 cup semi-sweet chocolate chips - 1 cup mini marshmallows - 1 cup graham cracker crumbs For those who prefer different measurements, here's how to convert: - 1 ½ cups = 360 mL - ½ teaspoon = 2.5 mL - 1 cup = 240 mL - ½ cup = 120 mL - 1 large egg = about 50 grams - 1 teaspoon = 5 mL You can easily swap some ingredients if you like. Here are some ideas: - Use coconut oil instead of butter for a dairy-free option. - Replace granulated sugar with coconut sugar for a richer flavor. - Try using almond flour instead of all-purpose flour for a gluten-free treat. - If you want a different flavor, use white chocolate chips instead of semi-sweet. - You can use regular marshmallows instead of mini ones, just cut them into smaller pieces. {{ingredient_image_2}} Start by preheating your oven to 350°F (175°C). You want a warm oven to bake these bars. Next, grab a 9x9-inch baking pan. Lightly grease it or line it with parchment paper. This helps the bars come out easily after baking. In a medium bowl, add 1 ½ cups of all-purpose flour, ½ teaspoon of baking soda, and ½ teaspoon of salt. Whisk these dry ingredients together until they mix well. This step is key for even baking. In a large mixing bowl, take ½ cup of softened unsalted butter. Add ½ cup of packed brown sugar and ½ cup of granulated sugar. Use an electric mixer on medium speed. Mix for about 2 to 3 minutes. The mixture should become light and fluffy. Now, add 1 large egg and 1 teaspoon of pure vanilla extract to the butter-sugar mix. Blend these together until everything is smooth. This will make the batter rich and tasty. Gradually mix the dry flour mixture into the wet ingredients. Stir until just combined. Be careful not to overmix, as it can make the bars dense. You want a nice, soft batter. Next, gently fold in 1 cup of semi-sweet chocolate chips and 1 cup of graham cracker crumbs using a spatula. Keep a handful of each for topping. Spread half of the cookie batter into the prepared baking pan. Press it down evenly for a solid base. Sprinkle 1 cup of mini marshmallows evenly on the first layer of cookie batter. Top this with your reserved chocolate chips and graham cracker crumbs. Carefully spoon the rest of the cookie batter over the marshmallow layer, covering it as much as you can. Place the pan in the oven and bake for 25-30 minutes. The edges should be golden brown. The center should feel set when you touch it. Once baked, take the pan out of the oven. Let the bars cool completely in the pan. This step helps them hold their shape when you cut them. Slice into squares or rectangles to serve. For a fun touch, add more mini marshmallows and chocolate chips on top. Enjoy them warm or with a scoop of vanilla ice cream! To get the best texture in your S’mores cookie bars, use soft butter. This helps create a nice, fluffy mix. Do not overmix the batter after adding the flour. This keeps your bars light and chewy. The right balance of chocolate, marshmallows, and graham crumbs makes each bite special. Also, let the bars cool completely before slicing. This helps them hold their shape. Baking time is key. Set your timer for 25 minutes first. Check the edges; they should be golden brown. The center should feel set but not hard. If your oven runs hot, check them a bit earlier. Use a toothpick; if it comes out clean, your bars are ready. Keep an eye on them to avoid overbaking. Overbaking makes them dry and crumbly, not chewy. For a fun touch, serve the warm bars with extra mini marshmallows and chocolate chips on top. This adds a nice look and extra flavor. You can also pair them with a scoop of vanilla ice cream. The cold ice cream melts into the warm bars, creating a delicious mix. If you want to impress guests, cut the bars into fun shapes using cookie cutters. Pro Tips Chill the Dough: If you have time, chill the cookie dough for about 30 minutes before baking. This helps the bars maintain their shape and prevents them from spreading too much in the oven. Use Fresh Ingredients: Always opt for fresh marshmallows and chocolate chips for the best flavor and texture. Stale ingredients can affect the overall taste of your bars. Check for Doneness: To ensure your bars are perfectly baked, use a toothpick to check the center. It should come out with a few moist crumbs, but not wet batter. Layering Technique: When layering, make sure to spread the top layer gently to avoid disturbing the marshmallows and chocolate chips underneath. This keeps all the deliciousness intact! {{image_4}} You can switch up the chocolate to suit your taste. Use dark chocolate or milk chocolate chips instead of semi-sweet. For a fun twist, try white chocolate chips or even a mix of chocolates. Each type adds a new layer of flavor, making your S’mores cookie bars special. If you want to cut sugar, use honey or maple syrup. These options give a different sweetness and can add unique flavors. You can also try coconut sugar for a more natural choice. Just remember to adjust the wet ingredients since liquid sweeteners change the batter's texture. Adding nuts or fruits can give your bars a tasty crunch. Try chopped walnuts, pecans, or almonds for a nutty flavor. For fruit, you can add dried cherries or cranberries. These additions will enhance the texture and offer new flavors, making your bars truly unique. To make gluten-free S’mores cookie bars, just swap the all-purpose flour for a gluten-free blend. Many blends work well in cookie recipes. Ensure that your graham cracker crumbs are also gluten-free. This way, everyone can enjoy these delicious treats without worry. To keep your S’mores Cookie Bars fresh, store them in an airtight container. This helps maintain their soft texture. Place a layer of parchment paper between layers if you stack them. They stay fresh at room temperature for up to five days. If you want them to last longer, refrigerate them. They can stay good for about a week in the fridge. You can freeze S’mores Cookie Bars for later. First, let them cool completely. Then, cut them into squares. Wrap each square tightly in plastic wrap. Place the wrapped bars in a freezer-safe bag or container. They can last up to three months in the freezer. When you’re ready to enjoy them, just thaw them in the fridge overnight. To enjoy your S’mores Cookie Bars warm, preheat your oven to 350°F (175°C). Place the bars on a baking sheet. Cover them lightly with foil to keep them moist. Heat for about 10 minutes. You can also microwave them. Just place one bar on a plate and heat for 10 to 15 seconds. Enjoy that gooey goodness! You can tell when the bars are done by checking the edges. They should look golden brown. The center should feel set but not too firm. If you gently press the center, it should spring back slightly. This process usually takes about 25 to 30 minutes in the oven. Yes, you can use any type of graham crackers you like. Honey, cinnamon, or even chocolate-flavored ones work great. The taste will change a bit, but that adds fun to your recipe. Just crush them to make crumbs before mixing. To make them vegan, replace the butter with vegan butter. Use a flax egg instead of a regular egg. Mix one tablespoon of ground flaxseed with three tablespoons of water. Let it sit for five minutes to thicken. You can also choose dairy-free chocolate chips for a complete vegan treat. These bars taste great on their own, but you can add more fun. Serve them warm with a scoop of vanilla ice cream. A drizzle of chocolate sauce or a sprinkle of extra mini marshmallows also adds a nice touch. You can even pair them with a glass of milk for a classic combo. You learned how to make tasty S’mores Cookie Bars from scratch. We covered key ingredients, step-by-step mixing, and baking tips. Remember to experiment with different chocolates and toppings for fun flavors. Store them well, and they’ll stay fresh. Making these bars should be enjoyable and easy. Get creative and share your cookies with friends! Enjoy every bite of your delicious creation!

S’mores Cookie Bars

Delicious cookie bars combining chocolate, marshmallows, and graham crackers.
Print Recipe Pin Recipe
Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Course Dessert
Cuisine American
Servings 16
Calories 200 kcal

Ingredients
  

  • 1.5 cups all-purpose flour
  • 0.5 teaspoon baking soda
  • 0.5 teaspoon salt
  • 0.5 cup unsalted butter, softened to room temperature
  • 0.5 cup packed brown sugar
  • 0.5 cup granulated sugar
  • 1 large egg
  • 1 teaspoon pure vanilla extract
  • 1 cup semi-sweet chocolate chips
  • 1 cup mini marshmallows
  • 1 cup graham cracker crumbs

Instructions
 

  • Begin by preheating your oven to 350°F (175°C). Prepare a 9x9-inch baking pan by greasing it lightly or lining it with parchment paper for easy extraction of the bars later.
  • In a medium bowl, whisk together the all-purpose flour, baking soda, and salt until evenly combined. Set this flour mixture aside for later use.
  • In a large mixing bowl, cream the softened butter, packed brown sugar, and granulated sugar together using an electric mixer on medium speed until the mixture is light and fluffy—this should take about 2 to 3 minutes.
  • Add the egg and pure vanilla extract to the butter-sugar mixture. Mix well until all ingredients are fully incorporated, creating a smooth batter.
  • Gradually incorporate the flour mixture into the wet ingredients, mixing until just combined. Be careful not to overmix, as this can make the bars dense.
  • Carefully fold in the chocolate chips and graham cracker crumbs using a spatula, reserving a handful of each for topping the bars.
  • Spread half of the cookie batter into the prepared baking pan, using your fingers or the spatula to press it down evenly and create a solid base layer.
  • Sprinkle the mini marshmallows evenly across the first layer of cookie batter. Then, top with the reserved chocolate chips and graham cracker crumbs for added texture and flavor.
  • Gently spoon the remaining cookie batter over the marshmallow layer, spreading it out carefully to cover the toppings as much as possible.
  • Place the baking pan in the preheated oven and bake for 25-30 minutes. You’ll know they’re done when the edges are golden brown and the center feels set.
  • Once baked, remove the pan from the oven and allow the bars to cool completely in the pan. This cooling step is crucial for ensuring the bars hold their shape when sliced. Cut into squares or rectangles to serve.

Notes

For an extra touch, serve warm bars with additional mini marshmallows and chocolate chips on top.
Keyword cookie bars, dessert, s'mores

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