In a resealable plastic bag, place the chicken drumsticks and buttermilk.
Squeeze the air out and seal the bag tightly.
Refrigerate for about 2-3 hours.
In a shallow bowl, add flour, breadcrumbs, baking powder, herbs and spices and mix well.
Remove the chicken drumsticks from bag and shake off the excess buttermilk.
Coat chicken drumsticks with the flour mixture evenly.
Line the Air Fryer Basket with a piece of foil and then slide inside.
Adjust the temperature of Air Fryer to 390 °F to preheat for 5 minutes.
After preheating, arrange the chicken drumsticks into the prepared Air Fryer Basket in a single layer.
Slide the basket into Air Fryer and set the time for 20 minutes.
After 10 minutes of cooking, flip the chicken drumsticks and coat with melted butter.