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 deeper flavor penetration.
02 - In a large 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 thoroughly dry with paper towels. Coat every chicken piece completely in the seasoned flour mixture, pressing firmly to adhere the breading.
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 golden brown and cooked to an internal temperature of 165°F. Transfer to paper towels to drain.
05 - Stir together mayonnaise and Dijon mustard in a small bowl. Spread the mixture onto both halves of each slider bun. Layer lettuce, a crispy fried chicken piece, and a dill pickle slice on each bottom bun, then cap with the top half.
06 - Serve the sliders immediately while the chicken is still hot and the coating is at peak crispiness.