1.In A Bowl, Combine The Egg, Bread Crumbs, 1/4 Cup Soup And Onion. Crumble The Beef Over Mixture And Mix Well. Shape Into Six Patties. In A Large Nonstick Skillet, Brown The Patties On Both Sides; Drain. 2.In A Bowl, Combine The Milk, Browning Sauce If Desired, Salt And Remaining Soup; Stir In Mushrooms. Pour Over Patties. Reduce Heat; Cover And Simmer For 15-20 Minutes Or Until Meat Is No Longer Pink.