Place marinade ingredients in a food processor and puree into a smooth mixture. Taste for salt content, made any adjustments as needed.
Place chicken breasts into a resealable plastic bag or large glass dish. Pour marinade over top and turn to coat. Seal bag or cover dish with plastic wrap and place into refrigerator for 6-12 hours.
Preheat grill for medium high heat.
Remove chicken from marinade and place on the grill. Cook for 7-9 minutes per side or until internal temperature at thickest part of breast reaches 165 degrees F. Adjust heat as needed.
Once cooked through, remove from heat and let meat rest for a few minutes. Serve whole or slice and serve with your favorite sides.
For faster cooking, flatten the chicken breasts. Place one breast at a time between two pieces of plastic. Using the smooth side of a kitchen mallet, gently strike the chicken breasts from the center, moving outward to create a uniform thickness of 3/4". Marinate and grill as directed.