Pat chicken breasts dry with paper towels to remove excess moisture. This crucial step ensures better spice adhesion and surface browning.
Optional: If breasts are uneven in thickness, place them between plastic wrap and gently pound with a meat mallet until an even thickness of approximately ¾ inch is achieved.
In a bowl, combine olive oil with Cajun seasoning, salt, pepper, and optional brown sugar and baking powder. Mix to form a paste-like consistency.
Coat chicken breasts thoroughly on all sides with the seasoning mixture, pressing gently to adhere.
Allow seasoned chicken to rest at room temperature for 15-20 minutes for more even cooking and better flavor penetration.
Preheat your air fryer to 380°F (193°C) for 3-5 minutes.
Place the seasoned chicken breasts in the air fryer basket, ensuring they don't overlap. Leave space between pieces for optimal air circulation.
Air fry for 6 minutes, then flip the chicken breasts using tongs.
Continue cooking for another 6-8 minutes until the internal temperature reaches 165°F (74°C) when tested with a meat thermometer at the thickest part.
Transfer chicken to a cutting board and tent loosely with foil. Allow to rest for 5 minutes to redistribute juices throughout the meat.
Slice against the grain for maximum tenderness and serve immediately.