Instructions. Place chicken breasts in a resealable plastic bag or shallow, non-aluminum baking dish. Pour Italian dressing over the chicken to coat. Seal the plastic bag or cover the dish. Place in the refrigerator for 30 minutes to two hours.Use tongs to turn the chicken at least once while marinating. Remove the chicken from the refrigerator. Discard any Italian dressing that remains in the bag or dish. Grill the marinated chicken or bake in a 350 degree oven for 35 to 40 minutes.nstructions. Place chicken breasts in a resealable plastic bag or shallow, non-aluminum baking dish. Pour Italian dressing over the chicken to coat. Seal the plastic bag or cover the dish. Place in the refrigerator for 30 minutes to two hours.