Zucchini Casserole
["4 medium zucchini, sliced", "1 Tbsp. butter", "1 lb. hamburger", "1 Tbsp. salt", "1 large onion or onion soup mix", "1 can cream of mushroom soup"]
["Brown hamburger and onion or onion soup mix.", "Layer zucchini and then hamburger; add soup and repeat.", "Bake at 350\u00b0 for 40 minutes.", "Serves 4."]
["zucchini", "butter", "hamburger", "salt", "onion", "cream of mushroom soup"]