Heavenly Onions
["2 Tbsp. butter", "2 large white onions, cut in rings and halved", "1/2 lb. mushrooms, sliced", "1/2 lb. Swiss cheese, shredded", "10 slices French bread, both sides buttered (slice 1/4-inch thick and use more if needed)", "1 (10 3/4 oz.) can cream of mushroom soup", "1/2 c. milk", "2 tsp. soy sauce", "salt and pepper to taste"]
["Butter bread on both sides. Saut onions in 2 tablespoons butter. Butter 9 x 13-inch baking dish. Layer mushrooms, onions, cheese and bread. Mix soup, milk and soy sauce and pour over top. Sprinkle with salt and pepper. Cover and refrigerate overnight. Bake uncovered at 350\u00b0 for 45 minutes."]
["butter", "white onions", "mushrooms", "Swiss cheese", "bread", "cream of mushroom soup", "milk", "soy sauce", "salt"]