In a medium saucepan, bring 2 cups of vegetable broth to a rolling boil. Rinse the quinoa under cold water, then add it to the boiling broth. Lower the heat to a simmer, cover, and let it cook for about 15 minutes, or until all the liquid is absorbed and the quinoa is fluffy.
While the quinoa cooks, carefully slice the tops off each bell pepper, removing the seeds and membranes. Arrange the hollowed peppers upright in a baking dish for stuffing.
In a large skillet over medium heat, add a splash of olive oil and sauté the finely chopped onion and minced garlic for about 3-4 minutes, until the onion becomes soft and translucent.
To the skillet, add the cooked quinoa, rinsed black beans, corn, diced tomatoes, ground cumin, smoked paprika, chili powder, salt, and black pepper. Stir everything together to combine and continue cooking for an additional 5 minutes to heat through.
Generously spoon the quinoa filling into each bell pepper, pressing down slightly to pack it in. If there's any leftover filling, spread it around the peppers in the baking dish for extra flavor.
Cover the baking dish with aluminum foil and bake in the preheated oven for 25-30 minutes, or until the bell peppers are tender to the touch.
After 25-30 minutes, remove the foil and bake for an additional 10 minutes to give the tops a beautifully roasted finish.
Once baked, let the peppers cool for a few minutes. Garnish with fresh chopped cilantro and serve warm with slices of creamy avocado on the side.
Notes
For an inviting look, serve the stuffed peppers on a colorful platter and sprinkle them with additional cilantro for a burst of freshness. A wedge of lime alongside can enhance the flavors further!