Prep the chicken: Pat the chicken breasts dry with paper towels. If they’re very thick on one end, pound them to even thickness (about 3/4 to 1 inch) so they cook uniformly.
Preheat the air fryer: Set it to 375°F (190°C) for 3–5 minutes. A hot basket helps the chicken brown nicely.
Mix the garlic butter: In a small bowl, combine softened butter, minced garlic, paprika, Italian seasoning, onion powder, salt, and pepper. Stir until it forms a smooth paste.
Oil the chicken: Rub both sides of the chicken breasts with olive oil. This helps prevent sticking and promotes browning.
Coat with garlic butter: Spread the garlic butter mixture evenly over both sides of the chicken. Use a brush or the back of a spoon to get good coverage.
Air fry: Place the chicken in a single layer in the basket. Cook for 8–10 minutes, then flip and cook another 6–8 minutes. Start checking for doneness at the 14-minute mark.
Check temperature: Use an instant-read thermometer. The thickest part should reach 165°F (74°C). If needed, cook in 2–3 minute bursts until it hits the mark.
Rest the chicken: Transfer to a plate and let it rest for 5 minutes. This helps the juices settle so the chicken stays moist.
Finish and serve: Sprinkle with chopped parsley and a light squeeze of lemon. Slice against the grain and serve.