MIX dressing, onions and spices in large resealable plastic bag until well blended. Add chicken. Seal bag; turn to evenly coat chicken with dressing mixture.
REFRIGERATE 30 min. to marinate. Remove chicken from marinade; discard bag and marinade.
PREHEAT broiler. Broil chicken, 4 inches from heat, 5 to 6 min. on each side or until cooked through (170°F).