01 - In a large bowl, whisk together buttermilk, salt, garlic powder, onion powder, cayenne pepper, and black pepper until thoroughly combined. Add chicken pieces, turning to coat completely. Cover bowl and refrigerate for minimum 2 hours, preferably overnight for maximum flavor penetration.
02 - In a separate bowl, combine flour, paprika, salt, black pepper, cayenne pepper, and baking powder. Whisk well to ensure even distribution of spices throughout the flour.
03 - Remove chicken from marinade, allowing excess liquid to drip off. Press each piece firmly into flour mixture, turning to coat all sides. Apply pressure to ensure 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.
05 - Carefully lower chicken pieces into hot oil in small batches, avoiding overcrowding. Fry for 12-15 minutes, turning occasionally, until golden brown and crispy. Internal temperature must reach 165°F for safe consumption.
06 - Transfer fried chicken to wire rack or paper towels to drain excess oil. Let rest for 5 minutes before serving to allow juices to redistribute.