01 - Place chicken pieces in a bowl and cover with pickle brine and hot sauce. Cover and refrigerate for at least 2 hours, or overnight for best flavor.
02 - In a large bowl, combine flour, cornstarch, garlic powder, onion powder, smoked paprika, kosher salt, and black pepper. Mix until evenly distributed.
03 - Remove chicken from brine and discard the brine. Pat chicken dry thoroughly with paper towels. Coat each piece completely in the flour mixture, pressing firmly to adhere.
04 - Heat oil in a deep skillet or pot to 350°F. Fry chicken pieces in batches for 4 to 6 minutes per side until golden brown and cooked through to an internal temperature of 165°F. Drain on paper towels.
05 - In a small bowl, mix mayonnaise and Dijon mustard until smooth and well combined.
06 - Spread the mayonnaise-mustard sauce on both halves of each slider bun. Layer lettuce, a fried chicken piece, and a dill pickle slice on the bottom bun. Cap with the top bun.
07 - Serve immediately while the chicken is hot and crispy.