Make sure to maintain consistent oil temperature for even cooking. If you don't have buttermilk, make a quick substitute by adding 1 tablespoon of lemon juice or white vinegar to each cup of regular milk and letting it sit for 10 minutes before using. For leftovers, avoid microwaving as it makes the coating soggy - reheat on a wire rack in a 375°F oven for 15-20 minutes instead.