Cut the tops off the bell peppers and remove the seeds and membranes. Place the peppers upright in a baking dish.
In a medium saucepan, cook the quinoa or rice according to package instructions. Once cooked, set aside.
In a large skillet, heat olive oil over medium heat. Sauté the chopped onion until translucent, about 3-5 minutes.
Add minced garlic to the skillet and cook for an additional minute until fragrant.
Stir in the corn, black beans, diced tomatoes, cooked quinoa/rice, cumin, paprika, salt, and pepper. Mix well and cook until heated through, about 5 minutes.
Remove the skillet from heat and stir in half of the shredded cheese, mixing until melted and well combined.
Carefully spoon the stuffing mixture into each bell pepper, pressing down slightly to pack them.
Top each stuffed pepper with the remaining shredded cheese.
Cover the baking dish with foil and bake in the preheated oven for 25 minutes.
After 25 minutes, remove the foil and bake for an additional 10-15 minutes or until the peppers are tender and cheese is bubbly.
Remove from the oven and let cool for a few minutes before serving. Garnish with fresh cilantro or parsley.
Notes
Feel free to customize the filling with your favorite ingredients.