01 - In a large bowl, combine the buttermilk and hot sauce. Add the chicken pieces, turning to coat. Cover and marinate in the refrigerator for at least 1 hour, or overnight for best results.
02 - Preheat oven to 425°F. In a large bowl, whisk together flour, baking powder, baking soda, salt, and sugar. Add cold butter and use a pastry cutter or fingers to work it in until the mixture resembles coarse crumbs. Stir in buttermilk just until combined; do not overmix.
03 - Turn dough onto a lightly floured surface. Pat into a 1-inch thick rectangle. Use a round cutter to cut biscuits, rerolling scraps if needed. Place on a parchment-lined baking sheet. Brush tops with extra buttermilk. Bake 12–15 minutes until golden. Cool slightly before serving.
04 - In a shallow dish, mix flour, cornstarch, paprika, garlic powder, onion powder, cayenne, salt, and black pepper. Remove chicken from marinade, letting excess drip off. Dredge each piece in the seasoned flour, pressing to adhere. Place on a wire rack and let rest 10 minutes.
05 - Fill a large, heavy skillet or Dutch oven with 1 inch of vegetable oil. Heat to 350°F. Fry chicken in batches, skin side down first, until golden brown and cooked through (internal temp 165°F), about 15–18 minutes per batch. Drain on paper towels.
06 - Serve the hot fried chicken with freshly baked buttermilk biscuits.