Begin by preparing the marinade. In a Ziploc bag, add in the buttermilk, pickle juice, Nashville hot sauce, and large egg.
Add the chicken into the bag and lay flat in a pan to fully coat, let this sit in the fridge and soak for at least 4 hours.
When ready to cook, prepare a bowl with flour, salt, garlic powder, and cayenne pepper.
Pull each piece of chicken out of the bag, shake off the excess marinade, dip it in the flour. Place back in the bag and dip again, shake off, then dip in the flour. It gets dipped twice.
Carefully place the chicken on a lined air fryer basket or spray the basket with grapeseed oil spray.
Repeat this for the remaining chicken, cook in batches if needed.
Cook in the air fryer at 390*F for 12-15 minutes or until the internal temperature reaches at least 165*F to serve. It's best to flip the chicken and spray again with grapeseed oil spray about halfway through the cooking time.
Repeat for the remaining batches.
Once fully cooked, use the hot sauce and fully coat the chicken with it before serving.