Heavenly Onion Casserole
["2 Tbsp. butter or margarine", "3 medium sweet Spanish onions, sliced", "8 oz. fresh mushrooms, sliced", "1 c. (4 oz.) shredded Swiss cheese", "1 can evaporated milk (5 oz.)", "1 can condensed cream of mushroom soup, undiluted", "2 tsp. soy sauce", "6 to 8 slices French bread (1/2-inch thick)", "6 to 8 thin slices Swiss cheese (about 4 oz.)"]
["Melt butter over medium high heat.", "Saute onions and mushrooms until tender.", "Place in 12 x 7 1/2 x 2-inch baking dish or 2-quart casserole.", "Sprinkle shredded cheese on top.", "Combine soup, milk and soy sauce.", "Pour over cheese.", "Top with bread and cheese slices.", "Cover and refrigerate 4 hours or overnight.", "Bake loosely covered for 30 minutes at 375\u00b0.", "Uncover and bake 15 to 20 minutes longer or until heated through.", "Let stand 5 minutes before serving.", "Yields 6 to 8 servings."]
["butter", "sweet Spanish onions", "fresh mushrooms", "Swiss cheese", "milk", "condensed cream", "soy sauce", "bread", "Swiss cheese"]