01 - Combine chicken pieces, pickle brine, and hot sauce in a bowl. Cover and refrigerate for at least 2 hours, or up to 8 hours for deeper flavor penetration.
02 - Remove chicken from the brine and pat thoroughly dry with paper towels to ensure the breading adheres properly.
03 - In a shallow bowl, whisk together flour, cornstarch, garlic powder, onion powder, smoked paprika, salt, and pepper. Pour buttermilk into a separate shallow bowl.
04 - Dredge each chicken piece in the flour mixture, dip into the buttermilk, then return to the flour mixture, pressing firmly to ensure full, even coverage on all sides.
05 - Pour about 2 inches of vegetable oil into a deep skillet or Dutch oven and heat to 350°F. Use a thermometer to monitor temperature accurately.
06 - Fry breaded chicken pieces in batches, avoiding overcrowding, until golden brown and cooked through, approximately 3 to 4 minutes per side. Transfer to a wire rack or paper towel-lined plate to drain.
07 - Lightly toast the slider buns in a dry skillet or under a broiler until golden on the cut sides.
08 - Spread mayonnaise on each bun bottom, layer with a lettuce leaf, a piece of fried chicken, and a dill pickle slice. Cap with the bun tops and serve warm.