Preheat the air fryer to 350°F (176°C).

Cut the tops off the bell peppers and remove the seeds and membranes and set aside.

In a skillet over medium heat, cook the ground beef until no longer pink, breaking it apart with a spatula as it cooks.

Add diced onion and minced garlic to the skillet with the beef and cook for 2-3 minutes until softened.

Stir in the black beans, diced tomatoes, ground cumin, chili powder, smoked paprika, salt, and pepper. Cook for another 2-3 minutes to allow the flavors to meld.

Fill each bell pepper with the beef mixture, pressing gently to pack it in.

Place the stuffed peppers in the air fryer basket, making sure they are stable and not tipping over.

Air fry the stuffed peppers at 350°F (176°C) for 12-15 minutes or until the peppers are tender, the filling is heated through.

Top each stuffed pepper with shredded Mexican cheese blend, dividing it evenly among the peppers. Continue to cook for another 4-5 minutes, until the cheese is melted and has a golden crust.

Once done, carefully remove the stuffed peppers from the air fryer and let them cool slightly before serving. Garnish the Air Fryer Mexican Stuffed Peppers with chopped green onions and serve.