Saute mushrooms in butter.Reserve.Butter bread and cut into 1" cubes.Put half of the bread in a shallow 2 qt. Baking dish. Crumble mushrooms and remaining ingredients, except soup and cheese.Spoon over bread, top with 1/2 of remaining bread.Refrigerate overnight.Before baking, spread soup over all.Top with remaining bread.Bake @ 300 degrees for 40 minutes.Sprinkle with cheese and bake 20 minutes more.