01 - In a large bowl, whisk together buttermilk, salt, garlic powder, onion powder, cayenne pepper, and black pepper until fully blended. Submerge chicken pieces in marinade, ensuring complete coating. Cover bowl and refrigerate for minimum 2 hours, preferably overnight for optimal flavor penetration.
02 - In a separate bowl, combine all-purpose flour, paprika, salt, black pepper, cayenne pepper, and baking powder. Whisk thoroughly to distribute spices evenly throughout flour mixture.
03 - Remove chicken from marinade, allowing excess liquid to drip off. Dredge each piece in flour mixture, pressing firmly to achieve thick, even coating. Transfer coated pieces to wire rack and rest for 10 minutes to set coating.
04 - In deep fryer or heavy-bottomed pot, heat vegetable oil to 350°F. Use kitchen thermometer to verify temperature accuracy before proceeding.
05 - Working in batches to avoid overcrowding, carefully lower chicken pieces into hot oil. Fry for 12-15 minutes, turning occasionally for even browning, until golden brown and crisp, and internal temperature reaches 165°F.
06 - Transfer fried chicken to wire rack or paper towels to drain excess oil. Let rest for 5 minutes before serving to maintain crispy texture.