Put chicken in zip top bag and pound gently with the flat side of a mallet until about ½" thick.
Cut each breast into 2 equal pieces lengthwise (so each of the 4 pieces should be about ¼" thick). Marinate chicken in the pickle juice for about an hour.
In s medium bowl, beat together egg and milk.
In a second bowl, mix together the flour, sugar, and spices.
Heat the oil in a skillet to about 350°F.
Dip each chicken piece into the egg mixture, covering both sides, then coat in the flour mixture on each side.
Fry each chicken piece for 2 minutes on each side, or until golden and cooked through and the internal temperature reaches 165℉.
Place on paper towels to absorb any excess oil. Then serve on toasted buns with pickle slices.