01 - Whisk buttermilk with salt, garlic powder, onion powder, cayenne, and black pepper in a large bowl. Submerge chicken pieces completely. Cover and refrigerate minimum 2 hours, preferably overnight for optimal flavor penetration.
02 - Combine flour, paprika, salt, black pepper, cayenne, and baking powder in a separate bowl. Blend thoroughly to distribute spices evenly.
03 - Remove chicken from marinade, allowing excess liquid to drip off. Press each piece firmly into flour mixture, ensuring thick, even coverage. Arrange on rack and rest 10 minutes to set coating.
04 - Pour vegetable oil into deep fryer or heavy pot. Heat to 350°F, maintaining temperature throughout cooking process.
05 - Lower chicken pieces into hot oil in small batches. Fry 12-15 minutes, turning occasionally, until deep golden brown and crisp. Internal temperature must reach 165°F. Avoid overcrowding to prevent temperature drop.
06 - Transfer cooked chicken to wire rack or paper towels. Let rest 5 minutes before serving to retain juices and maintain crispness.