Preheat oven to 350°F. Arrange opened Cooking Bag in 13x9-inch baking pan or dish. Mix beef, Seasoning Mix, egg, milk and bread crumbs in large bowl until well blended.
Shape meat mixture into 8x4-inch loaf. Place in bag. Add vegetables. 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 1 hour. Remove from oven. Let stand 5 minutes. Cut open bag. Slice meat loaf and serve with vegetables. If desired, serve with prepared McCormick® Brown Gravy or Mushroom Gravy.