Begin by placing the boneless chicken breasts at the bottom of your crockpot, ensuring they are evenly spread out.
In a separate medium-sized bowl, combine the cream of mushroom soup, chicken broth, and softened cream cheese. Whisk them together until the mixture is completely smooth. Stir in the minced garlic, Italian seasoning, salt, and pepper.
Pour this creamy concoction over the chicken in the crockpot, ensuring the chicken is well-coated.
Carefully add the chopped green bell pepper, finely diced onion, and diced tomatoes on top of the creamy mixture. Do not stir - let the layers sit as they are.
Cover the crockpot with its lid and cook on the low setting for 6-8 hours, or on high for 3-4 hours, until the chicken is thoroughly cooked and tender.
Once the cooking time is complete, take the chicken out of the crockpot and use two forks to shred it into bite-sized pieces. Return the shredded chicken to the pot and mix it into the sauce.
Break the spaghetti in half and gently stir it into the creamy mixture, ensuring the pasta is submerged. Cover and continue to cook on high for an additional 30 minutes, or until the spaghetti reaches al dente texture.
Next, stir in the shredded mozzarella cheese until it's fully melted and blended into the sauce. Taste and adjust any seasonings as needed.
Serve the creamy chicken spaghetti hot, garnished with freshly chopped parsley or basil as desired for an extra touch of flavor and color.
Notes
Garnish with fresh parsley or basil for added flavor.