Carefully slice the tops off the bell peppers and remove the seeds and membranes. Place the hollowed-out peppers upright in a baking dish.
In a large mixing bowl, combine the cooked quinoa, black beans, corn, diced tomatoes, cumin, smoked paprika, garlic powder, onion powder, salt, and pepper. Mix well until all ingredients are thoroughly combined.
Spoon the quinoa mixture into each bell pepper, packing it down slightly to fill them completely.
Top each stuffed pepper with a generous amount of shredded cheese.
Cover the baking dish with aluminum foil and bake in the preheated oven for 30 minutes.
After 30 minutes, remove the foil and bake for an additional 10-15 minutes, or until the peppers are tender and the cheese is bubbly and golden.
Remove from the oven and let cool slightly before garnishing with freshly chopped cilantro.
Notes
Serve with a drizzle of olive oil and a side of avocado or salad for added freshness.