Cook quinoa according to package instructions.
Prepare the bell peppers by slicing the tops off and removing seeds.
In a large mixing bowl, combine cooked quinoa, black beans, corn, diced tomatoes, chili powder, cumin, salt, and pepper.
Drizzle with olive oil and mix thoroughly.
Stuff the prepared bell peppers with the quinoa mixture, packing it in gently.
Place the stuffed peppers in the air fryer basket, ensuring they do not touch each other.
Air fry the peppers at 360°F for 12-15 minutes.
Garnish with fresh cilantro before serving.