Begin by making the remoulade sauce. In a bowl, combine all the ingredients for the kickin' remoulade. Set aside to let the flavors meld while you prepare the chicken.
Next, prepare the chicken by cutting away any excess fat from the chicken thighs. Place the thighs in a medium-sized bowl.
Pour the buttermilk over the chicken. Then, stir in the hot sauce, garlic powder, and Kosher salt. Cover the bowl with plastic wrap and refrigerate for at least one hour, or preferably overnight. This step is crucial for flavor and tenderness.
When you're ready to fry the chicken, heat the oil in a large sturdy skillet to between 340°F to 350°F. This temperature is ideal for frying, ensuring a crispy exterior while keeping the chicken juicy inside.
While the oil heats, prepare the coating. In a separate medium-sized bowl, mix together the flour, cornstarch, garlic powder, chili powder, Kosher salt, and black pepper. Add about 5 tablespoons of the marinade from the chicken into the flour mixture and gently stir until small clumps begin to form.
Carefully remove one chicken thigh from the marinade, shaking off excess liquid. Dredge it in the flour mixture, turning several times until fully coated. Shake off any excess flour and place on a baking rack over a baking sheet. Repeat with the remaining chicken thighs.
Once the oil is hot, carefully add the breaded chicken thighs to the skillet, making sure not to overcrowd the pan. Fry them until they are golden brown and crispy, about 8 to 10 minutes. Use metal tongs to flip the chicken occasionally, ensuring even cooking.
Once cooked to an internal temperature of 165°F, remove the chicken from the oil and place it on a baking sheet lined with paper towels to absorb excess oil. Continue frying the remaining chicken.
While the chicken rests, toast the brioche buns in the oven until lightly browned. This adds another layer of texture and flavor.
Assemble the sandwiches by spreading a thin layer of the remoulade on the bottom bun. Place a fried chicken cutlet on top, add some dill pickle slices, and finish with the top bun. Serve immediately and enjoy the deliciousness!