Slice the tops off the bell peppers and remove the seeds and membranes. Brush the exterior with olive oil and arrange them in a baking dish.
In a medium pot, bring the vegetable broth to a boil. Add the rinsed quinoa, cover, and reduce heat to low. Simmer for about 15 minutes until fluffy.
In a large bowl, combine the cooked quinoa, black beans, corn, zucchini, cherry tomatoes, cumin, chili powder, salt, and pepper. Mix well.
Stuff each bell pepper with the quinoa mixture, pressing down gently.
Top each pepper with shredded cheese.
Cover the dish with foil and bake for 25 minutes. Remove the foil and bake for an additional 10-15 minutes until the peppers are tender and cheese is melted.
Let cool for a few minutes, then garnish with cilantro or parsley before serving.
Notes
Feel free to customize the filling with your favorite vegetables.