Combine first 6 ingredients in a large zip-top plastic bag; add chicken. Seal and marinate in refrigerator 4 hours, turning occasionally.
Remove chicken from bag, reserving marinade. Place marinade in a small saucepan. Bring to a boil; cook 1 minute.
Place chicken on grill rack coated with cooking spray; grill 20 minutes or until done, turning and basting frequently with the marinade. Garnish with lime wedges and green onion tops, if desired.