Slice the tops off each bell pepper and remove the seeds and membranes. Rinse under cold water and lightly rub the outside with olive oil. Place upright in a baking dish.
Heat a medium splash of olive oil in a large skillet over medium heat. Add the diced onion and minced garlic, and sauté for 3-5 minutes until the onion is translucent.
Add the ground turkey to the skillet, breaking it apart and cooking until no longer pink, about 5-7 minutes.
Stir in the cooked quinoa, black beans, corn, and diced tomatoes. Season with cumin, smoked paprika, chili powder, salt, and black pepper. Cook for another 3-4 minutes.
Spoon the turkey filling into each bell pepper, packing it gently but firmly.
Sprinkle shredded cheese over the top of each stuffed pepper.
Cover the baking dish with aluminum foil and bake for about 25 minutes. Remove the foil and bake for an additional 10-15 minutes until the peppers are tender and the cheese is bubbly.
Remove from the oven, let cool slightly, and garnish with fresh cilantro or parsley before serving.
Notes
Serve on a large platter with a drizzle of olive oil and a side salad for a complete meal.