Prep the chicken: Pat the chicken breasts dry with paper towels. If one side is much thicker, gently pound to an even 3/4–1 inch so they cook evenly.
Season generously: In a small bowl, mix salt, pepper, garlic powder, onion powder, paprika, and thyme.
Rub the chicken with oil, then coat all sides with the seasoning blend.
Preheat the air fryer: Set to 375°F (190°C) for 3 minutes. A hot basket helps you get a light crust.
Arrange in the basket: Place breasts in a single layer with space between them. Don’t stack.
Air fry: Cook for 8–10 minutes, flip, then cook 4–8 minutes more. Target internal temperature: 160–165°F (71–74°C) at the thickest point.
Rest: Transfer to a plate and rest 5 minutes.
This lets the juices redistribute for extra tenderness.
Finish and serve: Squeeze with lemon and sprinkle parsley if you like. Slice against the grain for the juiciest bites.