Cut the tops off the bell peppers and remove the seeds and membranes. Place them upright in a baking dish.
In a large mixing bowl, combine the cooked quinoa, black beans, corn, diced tomatoes with green chilies, cumin, chili powder, smoked paprika, salt, and pepper. Stir until well mixed.
Spoon the quinoa mixture into each prepared bell pepper, packing it down gently.
Top each stuffed pepper with a generous handful of shredded cheese.
Cover the baking dish with aluminum foil and bake in the preheated oven for 25 minutes.
Remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and golden.
Carefully remove the peppers from the oven and let them cool for a few minutes before serving.
Garnish the stuffed peppers with fresh chopped cilantro and serve with lime wedges on the side for squeezing.