In a medium saucepan, combine the rinsed quinoa with vegetable broth. Bring to a boil, then reduce to a simmer, cover, and cook for about 15 minutes or until liquid is absorbed. Fluff with a fork and set aside.
Slice the tops off the peppers and remove the seeds and white membranes inside. Lightly brush the exterior of the peppers with olive oil. Place them upright in a baking dish.
In a large mixing bowl, combine the cooked quinoa, black beans, corn, diced tomatoes, cumin, chili powder, smoked paprika, salt, and pepper. Mix until all ingredients are well combined.
Stuff each bell pepper with the quinoa mixture until they are filled to the top, pressing down gently if needed.
Sprinkle the shredded cheese evenly on top of each stuffed pepper.
Cover the baking dish with aluminum foil and bake for 25 minutes. Remove the foil and bake for an additional 10-15 minutes until the cheese is melted and bubbling.
Once cooked, remove from the oven and allow to cool slightly. Garnish with chopped cilantro and serve with lime wedges on the side for squeezing over the top.
Notes
Feel free to customize the filling with your favorite vegetables.