1. In a large bowl, mix buttermilk and hot sauce. Add chicken, cover, and refrigerate for at least 2 hours.
2. In another bowl, combine flour, paprika, garlic powder, salt, and black pepper.
3. Heat oil in a deep fryer to 350°F (175°C).
4. Dredge marinated chicken in the flour mixture, ensuring an even coat.
5. Fry chicken in batches until golden brown and cooked through, about 15 minutes. Drain on paper towels.
6. For the hot oil mixture, combine cayenne pepper, brown sugar, garlic powder, and paprika in a bowl. Carefully whisk in 1 cup of hot frying oil.
7. Brush the hot oil mixture over the fried chicken. Serve immediately.