Whisk all ingredients but chicken in a medium bowl.
If chicken breasts are not uniform in size, cut in half so that they are all less than 1 inch thick.
Place chicken brests in a gallon bag and pierce all over with a fork.
Ladle 1/2 of the marinade over the chicken.
Close bag and massage marinade into the chicken. Let sit on counter while you heat the grill to medium-high.
Place chicken on grill and cook for 4-5 minutes per side, basting when you flip. Make sure you remove it as soon as it hits 165°.
Place chicken on platter and cover with foil.
Place remaining marinade in a small saucepan and heat on medium-high until slightly thickened and bubbling (about 5 minutes).
Serve chicken with sauce drizzled on top