Combine the quinoa, salsa, nutritional yeast, cumin, chili powder, garlic powder, black beans, corn, green onion, and salt and pepper to taste in a large bowl.
Stuff the halved peppers with the quinoa mixture.
Place the crisper plate into the COSORI Air Fryer basket.
Select the Preheat function, adjust temperature to 380°F, then tap Start/Pause.
Place the pepper halves cut-side up onto the preheated crisper plate and sprinkle the tops with cheese.
Select the Air Fry function, adjust temperature to 380°F and time to 12 minutes, then tap Start/Pause.
Remove the peppers when done and serve with your desired toppings.