Pound breasts with mallet between 2 pieces of parchment or wax paper until 1/2 inch thick.
Mix all ingredients together in a small bowl or measuring cup. Place pounded chicken breasts inside 2 gallon zip-lock bags (3 breasts per bag), press air out and seal shut. Massage marinade into the breasts until even coated. Place the bag in a bowl in the refrigerator, and let the chicken marinate for 5-6 hours or more.
Preheat grill to high. Place chicken on grill, spooning marinade over top. Grill, covered, for 2-3 minutes per side.
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