Steps
1. Preheat your oven to 375°F (190°C).
2. Cut the top off the bell pepper and remove the seeds and membranes.
3. In a bowl, combine cooked quinoa, black beans, corn, diced tomatoes, onion, cumin, salt, and pepper.
4. Stuff the mixture into the hollowed bell pepper.
5. Place the stuffed pepper in a small baking dish and cover with foil.
6. Bake for 25 minutes, then remove the foil, sprinkle cheese on top (if using), and bake for an additional 5 minutes until cheese is melted and bubbly.
7. Garnish with fresh cilantro before serving.