Make classic Beef Barley Soup easily in your slow cooker with Slow Cookers Vegetable Beef Soup Seasoning Mix.
Place beef and vegetables in slow cooker.
Mix Seasoning Mix and water until blended. Pour over beef and vegetables. Cover.
Cook 7 hours on LOW. Stir in mushrooms and barley. Cover. Cook 1 hour longer on HIGH or until barley is tender. Stir before serving.
For best results, do not remove cover during cooking.