Creating a Crispy Buttermilk Fried Chicken Sandwich involves a few simple steps. Follow this guide for a stress-free cooking experience:

1. Marinate the Chicken: In a large bowl, combine buttermilk, hot sauce, garlic powder, onion powder, smoked paprika, cayenne pepper, salt, and pepper. Add the chicken thighs, ensuring they are all coated. Cover and refrigerate for at least 4 hours or overnight.
2. Prepare the Coating: In another bowl, mix together the flour, baking powder, paprika, and season with salt and pepper.
3. Heat the Oil: In a large skillet or deep fryer, heat oil over medium-high heat. The oil should reach about 350°F (175°C).
4. Coat the Chicken: Remove the marinated chicken from the fridge. Let excess buttermilk drip off, then dredge each piece in the flour mixture, pressing firmly to ensure an even coating.
5. Fry the Chicken: Working in batches, carefully place the coated chicken pieces in the hot oil. Fry until golden brown and crispy, approximately 5-7 minutes per side. Ensure the internal temperature reaches 165°F (75°C).
6. Drain the Chicken: Once cooked, place the fried chicken on a wire rack or paper towels to drain excess oil.
7. Toast the Buns: Lightly toast your hamburger buns in the same oil for a few seconds to add flavor and texture.
8. Assemble the Sandwich: Spread mayonnaise on the bottom bun. Layer with lettuce, fried chicken, sliced tomatoes, pickles, and top with the other half of the bun.
9. Serve Immediately: Enjoy your Crispy Buttermilk Fried Chicken Sandwich while it’s hot and crispy!