Generously season both sides of chicken breasts with blackening seasoning then place into the basket of the air fryer. Lightly mist the top of it with cooking spray.
1-2 tablespoons blackening seasoning, 2 large boneless, skinless chicken breasts
Cook at 380 °F (193 °C) for 9 minutes and flip halfway through. Check for doneness with a meat thermometer. You want the internal temperature to be 165 °F (74 °C).