01 - Place the chicken pieces in a non-reactive bowl and pour the pickle brine and hot sauce over them, ensuring the chicken is fully submerged. Cover tightly with plastic wrap and refrigerate for a minimum of 2 hours, or ideally overnight for the most pronounced flavor.
02 - In a large mixing bowl, whisk together the all-purpose flour, cornstarch, garlic powder, onion powder, smoked paprika, kosher salt, and black pepper until evenly combined.
03 - Remove the chicken from the brine and discard the used marinade. Pat each piece thoroughly dry with paper towels. Dredge each chicken piece in the seasoned flour mixture, pressing firmly to ensure a complete and even coating on all sides.
04 - Heat the vegetable oil in a deep skillet or heavy-bottomed pot to 350°F. Carefully lower the breaded chicken pieces into the hot oil in small batches to avoid overcrowding. Fry for 4–6 minutes per side until deeply golden brown and cooked through to an internal temperature of 165°F. Transfer to a paper towel-lined plate to drain excess oil.
05 - In a small bowl, stir together the mayonnaise and Dijon mustard until smooth. Spread the mixture generously on both halves of each slider bun. Layer the bottom bun with a piece of lettuce, a hot fried chicken piece, and a dill pickle slice. Cap with the top bun.
06 - Serve the sliders immediately while the chicken is still hot and the exterior remains crisp.