1.In A Small Bowl, Combine The Egg, Bread Crumbs, Garlic Powder And Pepper. Crumble Beef Over Mixture; Mix Well. Shape Into Two Patties; Dredge In 2 Tablespoons Flour. In A Small Skillet, Brown Patties On Both Sides In Oil; Drain. Set Patties Aside. 2.Add The Remaining Flour To The Skillet; Whisk In Water Until Smooth. Stir In The Ketchup, Worcestershire Sauce And Bouillon. Add The Onion And Mushrooms. Bring To A Boil. Return Patties To The Pan. Reduce Heat; Cover And Simmer For 15-20 Minutes Or Until Beef Is No Longer Pink. Serve Gravy Over Patties.