Place gallon-size resealable food-storage plastic bag in aluminum grill pan. Add 1/2 cup of the dressing to bag. Remove and discard neck and giblets from chicken cavity. Pat chicken dry with paper towels. Add chicken to dressing in bag; remove air and seal. Turn bag to coat chicken, then place bag in pan, breast side down, and refrigerate at least 1 hour but no longer than 12 hours.