Preheat oven to 350°F. Place opened Cooking Bag in 13x9-inch baking pan or dish. Mix Seasoning Mix, vinegar, Worcestershire sauce, pepper and mustard in bag.
Place chicken in bag; coat evenly with seasoning mixture. Arrange chicken in single layer in bag. Close bag loosely with nylon tie. Cut 4 small holes in top of bag to allow steam to escape.
Bake in lower half of oven 45 to 50 minutes or until chicken is cooked through. Let stand 5 minutes. Serve chicken with sauce.