Marinate the chicken thighs in buttermilk for at least 2 hours or overnight.
In a bowl, mix flour, cayenne pepper, paprika, garlic powder, onion powder, salt, and black pepper.
Remove chicken from buttermilk and dredge in the flour mixture until fully coated.
Heat oil in a deep fryer or large skillet to 350°F (175°C).
Fry the chicken for about 8-10 minutes until golden brown and cooked through.
In a separate bowl, mix mayonnaise and hot sauce to create a spicy sauce.
Assemble the sandwiches by placing the fried chicken on the buns, adding pickles, and drizzling with the spicy sauce.
Serve hot and enjoy!