01 - In a large bowl, whisk together buttermilk, hot sauce, sea salt, and black pepper until well combined. Add the chicken pieces, turning to coat evenly. Cover tightly and refrigerate for at least 2 hours, or up to overnight for deeper flavor penetration.
02 - In a separate large bowl or shallow dish, combine all-purpose flour, cornstarch, paprika, garlic powder, onion powder, cayenne pepper, salt, and black pepper. Whisk thoroughly to ensure even distribution of all seasonings.
03 - Remove chicken from the marinade, allowing excess buttermilk to drip off. Dredge each piece in the seasoned flour mixture, pressing firmly on all sides to build a thick, even coating. Arrange coated pieces on a wire rack and let rest for 10 minutes to allow the coating to adhere.
04 - Pour vegetable oil to a depth of 2 inches into a heavy-bottomed skillet or deep fryer. Heat over medium-high heat until the oil reaches 350°F (175°C). Use a thermometer to monitor and maintain consistent temperature throughout frying.
05 - Carefully lower chicken pieces into the hot oil in batches, avoiding overcrowding. Fry for 12 to 15 minutes, turning occasionally, until deep golden brown and the internal temperature registers 165°F (74°C). Transfer finished pieces to a paper towel-lined plate or wire rack to drain.
06 - While the chicken fries, melt unsalted butter in a small saucepan over medium heat. Stir in honey, hot sauce, crushed red pepper flakes if using, and a pinch of salt. Simmer for 1 minute, stirring continuously, until the glaze is smooth and well blended.
07 - Drizzle the spicy honey butter glaze generously over the fried chicken, or toss pieces in a large bowl to coat evenly. Serve immediately while the coating remains crisp.