Marinate the chicken in the milk marinade (garlic powder, salt, black pepper, milk) for 8-12 hours in the fridge.
Place flour, beaten egg, and panko crumbs into separate shallow dishes.
Coat the chicken in flour, shaking off any excess, then dip into the egg, and press into the panko crumbs until well coated on both sides.
Pack 6-7 pieces of tenderloins as one meal, place them in a ziplock bag, and freeze.
