Brine the chicken if time allows it. Slice the chicken into cutlets, sprinkle with salt and pepper, cover, and refrigerate for 30 minutes to an hour.
Remove the chicken from the fridge and prepare the breading. In a shallow bowl, mix the all-purpose flour with salt and pepper. In another bowl, whisk the buttermilk with hot sauce.
Take a tablespoon of the buttermilk mixture and add it to the flour, then use your hands to create crumbles.
Dredge the chicken in flour, shaking off any excess, then dip in buttermilk, and coat again with flour. Shake off excess flour.
Heat oil in a dutch oven to 350˚F (160°C). Fry chicken pieces, 2 at a time, for 3-4 minutes on each side until golden brown and cooked through (internal temperature reaches 160°F or 74°C). Place fried chicken on a cooling rack in the oven to keep warm.
While frying chicken, prepare the Nashville hot sauce. In a small bowl, combine frying oil with brown sugar, cayenne powder, chili powder, paprika, and garlic powder. Baste the hot chicken with this sauce immediately after frying.
Assemble the sandwiches by spreading mayo on toasted buns, then adding fried chicken, coleslaw, and pickle chips.