Step 1: Pat Dry and Even Out the Thickness: Press the chicken breasts firmly with paper towels to remove surface moisture. If one end is much thicker than the other — which it almost always is — use a meat mallet or a rolling pin to gently pound the thick end down to an even ~2cm thickness. Uniform thickness means the breast cooks evenly: no raw thick spot, no dry thin end.
Step 2: Make the Herb Oil: In a small bowl, whisk the olive oil with the rosemary, thyme, black pepper, grated garlic, and lemon zest into a loose herb oil. Brush it generously over both sides of each breast so every bite carries the herb flavor, not just the surface.
Step 3: Load the Basket: Line the air fryer basket with parchment for easy cleanup. Lay the breasts flat and do not overlap them. Set the air fryer to 180°C (360°F) for 15 minutes. Crowding traps steam and softens the crust, so give each breast its own space.
Step 4: Flip at the Halfway Mark: Pull the basket out at the 8-minute mark and flip the breasts so both faces color evenly. If you have any herb oil left, brush it on again to boost aroma and moisture.
Step 5: Check Doneness and Rest: The chicken is done when a chopstick slipped into the thickest part releases clear juices and the center reads 74°C (165°F). Lift the breasts out and rest them 3 minutes before slicing — the juices redistribute so the meat stays bright and never dry. Finish with a squeeze of lemon.