Cut part of chicken breasts into 4 large pieces for sandwiches. Pound flat so they are about the size of the buns,
Cut rest of chicken into smaller nugget size pieces.
Place chicken in bowl or bag, season with salt and pepper, add pickle juice and brine for at least an hour.
Heat sous vide bath to 145 degrees. Remove from brine. Place in sous vide bag and seal. Cook for 1.5 to 2 hours.
While chicken cooks combine dry ingredients in one bowl and wet ingredients in another bowl. Add oil to large pot.
Remove chicken from sous vide and put on plate. Heat oil to 375 degrees. Place dry bowl next to pot, followed by wet bowl and chicken.
Working in batches, dip a small number of chicken pieces into wet bowl, then dry bowl and then into pot. Fry for about 2 minutes until golden brown. Check and adjust oil temperature as needed.
Serve chicken sandwiches on toasted hamburger buns with condiments of choice. Chicken nuggets can be served separately with ketchup, ranch or other sauce.