In a medium bowl, mix buttermilk and hot sauce. In a large bag or bowl, combine flour, cornstarch, seasoned salt, paprika, cayenne, black pepper, garlic powder, and onion powder.
Coat the chicken pieces in the seasoned flour, then in the buttermilk mixture, and back into the flour. Let rest on a baking sheet for 15-20 minutes.
Heat 2-2.5 inches of vegetable oil in a cast iron skillet over medium-high heat. Test with a pinch of flour; if it sizzles, it's ready.
Fry four pieces at a time until golden brown, covering with a lid to steam slightly. Continue frying until crispy and deep golden brown.
Transfer finished chicken to paper towels to drain and keep warm in an oven set to 275°F.
In a heat-safe bowl, whisk together 1 cup of hot frying oil, cayenne pepper, brown sugar, chili powder, garlic powder, and smoked paprika.
Brush the hot oil mixture generously over each piece of chicken.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days. Reheat in a 350°F oven to keep the crust crispy.