Prepare the Chicken Breast: Cut the whole boneless chicken breast in half lengthwise to create two even pieces.
Season the Chicken: Mix black pepper, sea salt, turmeric, cayenne pepper, and dried oregano in a small bowl. Rub this seasoning inside and outside each chicken breast. Drizzle olive oil over the chicken and rub it in.
Air Fry the Chicken: Preheat the air fryer to 350°F (176°C) for 5 minutes. Place the seasoned chicken breasts in the air fryer basket without overlapping. Cook at 350°F (176°C) for 18 minutes.
Serve: Remove the chicken breasts from the air fryer and let them rest for 3 minutes. Serve immediately.