Stir The Soup, Water, Worcestershire Sauce, Mushrooms, Onions, Garlic And Black Pepper In A 6-Quart Slow Cooker. Add The Beef And Stir To Coat. Cover And Cook On Low For 8 To 9 Hours Or Until The Beef Is Fork-Tender. Stir The Sour Cream In The Cooker. Serve The Beef Mixture With The Noodles. Sprinkle With The Parsley, If Desired.