Pour 1/2 cup Italian Dressing over chicken in large, shallow glass baking dish or plastic bag. Cover or close bag. Marinate chicken in refrigerator, turning occasionally, 30 minutes to 3 hours. Remove chicken from marinade, discarding marinade.

Grill or broil chicken, turning once and brushing frequently with remaining 1/4 cup dressing, until chicken is thoroughly cooked (165°F), about 12 minutes.