01 - Whisk buttermilk with salt, garlic powder, onion powder, cayenne, and black pepper in a large bowl until fully combined.
02 - Submerge chicken pieces in the buttermilk mixture, ensuring complete coverage. Cover and refrigerate for minimum 2 hours or ideally overnight for maximum flavor penetration.
03 - Combine flour, paprika, salt, black pepper, cayenne, and baking powder in a separate bowl. Mix thoroughly to distribute spices evenly.
04 - Remove chicken from marinade, allowing excess liquid to drip off. Press each piece firmly into the flour mixture, creating a thick, even coating. Transfer to a wire rack and rest for 10 minutes to set the crust.
05 - Pour vegetable oil into a deep fryer or heavy-bottomed pot. Heat to 350°F, maintaining consistent temperature throughout frying.
06 - Carefully lower chicken pieces into hot oil in small batches, avoiding overcrowding. Fry for 12 to 15 minutes, turning occasionally, until golden brown and crisp. Internal temperature must reach 165°F.
07 - Transfer fried chicken to a wire rack or paper towels to drain excess oil. Let rest for 5 minutes before serving to allow juices to redistribute.