01 - Combine buttermilk and hot sauce in a large bowl. Add chicken pieces, turning to coat thoroughly. Cover and refrigerate for at least 1 hour, preferably overnight for maximum flavor penetration.
02 - Preheat oven to 425°F. Whisk flour, baking powder, baking soda, salt, and sugar in a large bowl. Cut in cold butter using pastry cutter or fingers until mixture resembles coarse crumbs. Add buttermilk and stir just until combined—avoid overmixing.
03 - Turn dough onto lightly floured surface and pat into 1-inch thick rectangle. Cut rounds with biscuit cutter, rerolling scraps once. Place on parchment-lined baking sheet, brush tops with buttermilk. Bake 12–15 minutes until golden brown.
04 - Mix flour, cornstarch, paprika, garlic powder, onion powder, cayenne, salt, and black pepper in shallow dish. Remove chicken from marinade, allowing excess to drip off. Press each piece into seasoned flour mixture, coating completely. Transfer to wire rack and rest 10 minutes.
05 - Pour 1 inch vegetable oil into large skillet or Dutch oven. Heat to 350°F. Fry chicken in batches, starting skin side down, until golden brown and internal temperature reaches 165°F, approximately 15–18 minutes per batch. Drain on paper towels.
06 - Plate hot fried chicken alongside warm buttermilk biscuits. Serve immediately with optional honey, hot sauce, or gravy for dipping.