Add drumsticks to a dish and pour buttermilk over top so that each one is coated in buttermilk. Rotate in the dish if needed. Refrigerate for 30 minutes.
Combine flour with all spices and seasonings in a shallow dish.
Dredge each drumstick in flour and shake off any excess.
Lightly spray air fryer basket with cooking oil.
Add a single layer of chicken drumsticks to the basket and lightly spray with cooking oil.
Cook at 400 degrees Fahrenheit for 18-20 minutes, flipping halfway and spraying with additional cooking oil as needed on dry areas to allow them to crisp up.