Saute mushrooms in butter and drain. Heat and stir until smooth:soup, cheese, mushrooms, scallions, sherry. Add sliced eggs. Bake for 45 minutes-1 hour. This can be put together the day before. Stays micely on a warming tray for a long time. Can be served by itself or put on toast. (Serve with slotted spoon.) This has been served as Christmas Brunch in my family for many years.