01 - Whisk buttermilk, hot sauce, salt, pepper, garlic powder, and paprika in a bowl until combined. Submerge chicken thighs completely in the mixture. Marinate for 20 minutes minimum, or refrigerate overnight for optimal flavor penetration.
02 - Combine flour, cornstarch, salt, paprika, cayenne pepper, onion powder, and garlic powder in a large bowl. Whisk thoroughly to distribute spices evenly throughout the flour mixture.
03 - Remove chicken from marinade, allowing excess liquid to drip off. Press each thigh firmly into the flour mixture, ensuring complete coverage. Shake off loose flour and arrange coated pieces on a wire rack.
04 - Pour vegetable oil to 1-inch depth in a deep skillet or Dutch oven. Heat to 350°F, maintaining temperature throughout frying process.
05 - Working in batches, carefully place chicken in hot oil. Fry for 5 to 7 minutes per side until golden brown and crispy, reaching internal temperature of 165°F. Transfer to wire rack or paper towels to drain.
06 - Combine shredded cabbage, grated carrot, mayonnaise, apple cider vinegar, salt, and pepper in a bowl. Toss until vegetables are evenly coated. Adjust seasoning to taste.
07 - Lightly toast burger buns if desired. Spread mayonnaise on bottom bun, layer with lettuce, place fried chicken on top, add slaw and pickle slices, and finish with top bun.
08 - Serve immediately while chicken remains hot and crispy, with slaw providing cool contrast.