In a skillet, heat the oil on medium high heat and sauté the onions until lightly browned, about 5 minutes.
Stir in the chicken, rice, beans, chiles, cumin, salt, and pepper and cook until heated through. Remove from the heat and stir in the cheese.
Spoon 1 cup of the chicken mixture onto the bottom third of each tortilla. Fold the bottom and the sides up and roll until closed.
Spray the inside of the air fryer generously with cooking spray. Place two chimichangas inside the air fryer basked and lightly spray with cooking spray as well.
Air fry for about 4-6 minutes, flipping them half way through and lightly misting with cooking spray again on the other side.