Marinate the chicken:
Begin by thoroughly seasoning the chicken with kosher salt and ground black pepper. Submerge the seasoned chicken in a bowl filled with buttermilk, ensuring each piece is well-coated. Allow the chicken to marinate for a minimum of one hour, or for enhanced flavor, let it sit overnight.
Bread the chicken:
Prepare the breading mixture by combining all-purpose flour, seasoned salt, kosher salt, ground black pepper, garlic powder, and paprika in a bowl. Take the chicken pieces out of the buttermilk, shaking off any excess liquid, and coat them generously in the flour mixture. Place the breaded chicken on a clean plate or wire rack to rest briefly.
Air-fry the chicken:
If cooking an entire chicken, you will need to do this in two batches. Preheat your air fryer and spray the basket with nonstick spray. Arrange half of the chicken pieces in the basket, ensuring they do not touch to allow air circulation. Lightly spray the chicken with olive oil spray. Set the air fryer to 350°F and cook for 14 minutes. Using tongs, flip the chicken, spray lightly with oil again, and cook for an additional 10 to 12 minutes. The chicken is done when the white meat reaches an internal temperature of 165°F and the dark meat reaches 175°F (cooking the dark meat slightly longer makes it more tender and flavorful).