Buttermilk is the secret ingredient in this recipe that makes the chicken extra tender and juicy. The chicken is marinated in a mixture of buttermilk and spices, which helps to tenderize the meat and infuse it with flavor. After marinating, the chicken is coated in a seasoned flour mixture and cooked in the air fryer until golden brown and crispy. The result is a deliciously moist and flavorful fried chicken.