01 - Place chicken pieces in a bowl and submerge in pickle brine and hot sauce. Cover tightly and refrigerate for at least 2 hours, or overnight for optimal flavor penetration.
02 - In a large mixing bowl, whisk together flour, cornstarch, garlic powder, onion powder, smoked paprika, kosher salt, and black pepper until evenly combined.
03 - Remove chicken from the brine and discard the used liquid. Pat each piece dry thoroughly with paper towels. Coat chicken pieces in the seasoned flour mixture, pressing firmly to ensure full adhesion on all sides.
04 - Heat vegetable oil in a deep skillet or heavy-bottomed pot to 350°F. Carefully lower chicken pieces into the oil in small batches, frying 4 to 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.
05 - Stir mayonnaise and Dijon mustard together in a small bowl. Spread the sauce on the bottom half of each slider bun. Layer with a lettuce leaf half, a piece of fried chicken, and a dill pickle slice. Cap with the top bun.
06 - Serve the sliders immediately while the chicken is still hot and the coating is at peak crispiness.