Follow these simple steps to prepare Quinoa Stuffed Bell Peppers:

1. Preheat the Oven: Preheat your oven to 375°F (190°C).

2. Prepare the Peppers: Slice the tops off the bell peppers and remove the seeds and membranes. Place them upright in a baking dish.

3. Cook Quinoa: In a medium saucepan, combine quinoa and vegetable broth. Bring to a boil, then reduce heat, cover, and simmer for about 15 minutes or until the liquid is absorbed.

4. Sauté Vegetables: In a skillet over medium heat, add a splash of water or oil. Sauté the diced onion and minced garlic until softened, about 3-4 minutes.

5. Combine Filling Ingredients: In a large bowl, mix the cooked quinoa, sautéed onion and garlic, black beans, corn, diced tomatoes, cumin, paprika, salt, and pepper. Stir until combined.

6. Stuff the Peppers: Divide the quinoa mixture evenly among the bell peppers. If using cheese, sprinkle some into the tops of the stuffed peppers.

7. Bake: Pour a little water (or vegetable broth) into the bottom of the baking dish to help steam the peppers. Cover the dish with foil and bake for 30 minutes.

8. Finish Baking: Remove the foil and bake for an additional 5-7 minutes, allowing cheese to melt, if using.

9. Garnish: Once done, remove from the oven, let cool slightly, and garnish with fresh cilantro if desired.

10. Serve: Enjoy your delicious and colorful Quinoa Stuffed Bell Peppers!