Preheat the oven to 375°F (190°C).
Rinse the quinoa under cold water in a fine mesh sieve. In a large pot, combine the rinsed quinoa and vegetable broth. Bring to a boil, then reduce heat to low, cover, and simmer for about 15 minutes or until the quinoa is fluffy and the liquid is absorbed. Remove from heat and set aside.
While the quinoa is cooking, cut the tops off the bell peppers and remove the seeds and membranes. Place the peppers upright in a baking dish.
In a mixing bowl, combine the cooked quinoa, black beans, corn, diced tomatoes, ground cumin, chili powder, salt, and pepper. Mix well to combine all ingredients.
Stuff each bell pepper with the quinoa mixture, packing it in tightly. Top each pepper with shredded cheese.
Drizzle olive oil over the stuffed peppers, cover the baking dish with foil, and bake in the preheated oven for 20 minutes.
After 20 minutes, remove the foil and bake for an additional 10 minutes, or until the cheese is melted and bubbly.
Remove from the oven and let cool for a few minutes before serving. Garnish with fresh cilantro and serve with lime wedges on the side.