01 - Whisk together buttermilk, hot sauce, garlic powder, onion powder, salt, and pepper in a large bowl. Submerge chicken thighs completely, cover, and refrigerate for 2 hours minimum or overnight for maximum flavor penetration.
02 - Combine flour, cornstarch, paprika, baking powder, cayenne, salt, and black pepper in a shallow dish. Blend thoroughly to ensure even distribution of spices and leavening agents.
03 - Pour vegetable oil into deep fryer or heavy-bottomed pot. Bring temperature to 350°F and maintain throughout cooking process for optimal crispiness.
04 - Remove chicken from marinade, allowing excess liquid to drip off. Press each piece firmly into flour mixture, turning to coat completely and creating a thick, craggy surface for maximum crunch.
05 - Lower chicken carefully into hot oil. Fry 6 to 8 minutes per piece, turning once, until deep golden brown and internal temperature reaches 165°F. Transfer to wire rack to drain excess oil.
06 - Lightly toast burger buns until golden edges form. For spicy variation, whisk mayonnaise with additional hot sauce to create signature spread.
07 - Spread prepared mayonnaise on bottom bun. Layer lettuce, fried chicken fillet, tomato slices, and pickles. Crown with top bun and serve immediately while chicken remains ultra-crispy.