American
Slice each chicken breast horizontally into 2 cutlets of about 125 g and pound them to an even 1.5 cm thickness.
Mix the buttermilk with 1 tsp of the salt, add the chicken, cover and refrigerate for 1-4 hours.
Heat the oil, about 4 cm deep, in a heavy pot to 170C, and mix the flour, paprika, garlic powder, pepper and remaining salt in a shallow dish.
Lift the cutlets out of the buttermilk, let the excess drip off and press them firmly into the seasoned flour on both sides.
Fry 2 cutlets at a time for 6-8 minutes, turning once, until deep golden and 74C in the center; drain on a rack.
Spread the cut sides of the buns with the butter and toast them in a frying pan for 1-2 minutes until golden.
Spread the mayonnaise on the top buns, put 3 pickle slices on each bottom bun, add the hot chicken and close the sandwiches.