01 - Whisk buttermilk, hot sauce, salt, pepper, garlic powder, and paprika in a bowl until fully combined. Add chicken thighs, turning to coat completely. Cover and marinate for at least 20 minutes, or refrigerate overnight for maximum flavor penetration.
02 - Combine flour, cornstarch, salt, paprika, cayenne pepper, onion powder, and garlic powder in a large bowl. Mix thoroughly to distribute spices evenly throughout the flour.
03 - Remove chicken from marinade, allowing excess liquid to drip off. Press each thigh firmly into the flour mixture, ensuring a thick, even coating on all sides. Place coated pieces on a wire rack for 5 minutes to set the crust.
04 - Pour vegetable oil into a deep skillet or Dutch oven to a depth of 1 inch. Heat to 350°F, maintaining steady temperature throughout cooking.
05 - Working in batches, place chicken thighs in hot oil without overcrowding. Fry for 5 to 7 minutes per side until golden brown and crispy, or until internal temperature reaches 165°F. Transfer to wire rack to drain excess oil.
06 - Toss shredded cabbage, grated carrot, mayonnaise, and apple cider vinegar in a medium bowl. Season with salt and pepper to taste. Mix until vegetables are evenly coated.
07 - Lightly toast burger buns if desired. Spread mayonnaise on bottom halves, add lettuce leaves, top with fried chicken thighs, pile slaw on chicken, add pickle slices, and cover with bun tops.
08 - Serve immediately while chicken remains hot and slaw stays crisp.