Steps
1. Preheat the oven to 375°F (190°C).
2. Cut the top off the bell pepper and remove seeds and membranes.
3. Cook quinoa according to package instructions (usually 1 part quinoa to 2 parts water, simmered for 15 minutes).
4. While quinoa cooks, heat olive oil in a skillet over medium heat and sauté onion and garlic until softened.
5. Add diced tomatoes, black beans, cumin, smoked paprika, salt, and pepper to the skillet. Cook for 3-4 minutes.
6. Mix the cooked quinoa with the bean and tomato mixture.
7. Stuff the bell pepper with the quinoa mixture and place it in a baking dish.
8. Sprinkle shredded cheese on top if using.
9. Bake for 20-25 minutes until the pepper is tender and cheese is melted and golden.
10. Garnish with fresh cilantro and serve warm.