01 - Place chicken pieces in a non-reactive bowl and submerge in pickle brine along with hot sauce. Cover tightly and refrigerate for at least 2 hours; overnight marination yields the most flavorful results.
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 chicken from the brine and discard the used liquid. Pat each piece thoroughly dry with paper towels, then coat generously in the seasoned flour mixture, pressing firmly to ensure full adhesion.
04 - Heat vegetable oil in a deep skillet or heavy-bottomed pot to 350°F. Working in batches to avoid overcrowding, fry chicken pieces for 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 together mayonnaise and Dijon mustard in a small bowl. Spread the mixture onto both halves of each slider bun. Layer on a lettuce half, a piece of fried chicken, and a dill pickle slice. Crown with the top bun.
06 - Serve the sliders immediately while the chicken is still hot and the coating is at peak crispness.