In a medium saucepan, combine the rinsed quinoa and vegetable broth. Bring to a boil, then reduce the heat and cover. Simmer for about 15 minutes or until the quinoa is fluffy and has absorbed all the liquid. Set aside.
In a large skillet, heat the olive oil over medium heat. Add the chopped onion and minced garlic, sautéing until the onion is translucent, about 3-5 minutes.
In the skillet, add the black beans, sweet corn, cooked quinoa, ground cumin, smoked paprika, chili powder, lime juice, salt, and pepper. Stir everything together for another 3-4 minutes until heated through.
While the filling is cooling slightly, carefully slice the tops off the bell peppers and remove the seeds and membranes. Place the heart-shaped peppers in a baking dish.
Lightly pack each bell pepper with the quinoa mixture, pressing down gently to fit the filling evenly.
Sprinkle a generous layer of shredded cheddar cheese over the 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, or until the peppers are tender and the cheese is bubbly and golden.
Once done, remove the peppers from the oven. Let them cool for a few minutes, then garnish with fresh cilantro and halved cherry tomatoes before serving.
Notes
Feel free to use plant-based cheese for a vegan option.