Trim fat off of chicken breasts. Place each breast in between two pieces of wax paper and pound to ½" thickness. Cut each breast into 2-3 smaller pieces (to fit bun size).
Mix marinade ingredients and pour over chicken breast pieces. Refrigerate 30-45 minutes.
Grill chicken for about 5 minutes on each side, or until internal temperature reaches 165 degrees.
Butter buns and place on grill until slightly toasted.
Spread each bun with mayonnaise (if desired) and top with fixins.
Video
Notes
Chicken thighs can be used in place of chicken breasts.Exact calories will depend on the type of bun that you use and toppings that you add. Ours were calculated with a small potato bun lightly brushed with butter and light mayo.