2 tbsp. butter
3 med. onions, sliced
8 oz. fresh mushrooms, sliced
1 c. (4 oz.) Swiss cheese, shredded
6-8 slices French bread
1 (10 3/4 oz.) can cream of mushroom soup, undiluted
1 (5 oz.) can evaporated milk
2 tsp. soy sauce
6-8 slices Swiss cheese

In skillet, melt butter. Saute onion and mushrooms until tender. Put in 7x12 inch baking pan. Sprinkle shredded cheese over top.

Combine soup, milk and soy sauce, pour over cheese. Top with bread slices and cheese slices. Cover and refrigerate overnight. Cover loosely and bake at 375 degrees for 30 minutes. Uncover and bake 15-20 minutes longer. Let stand 5 minutes before serving.