Potato Hamburger Casserole
["5 to 6 potatoes, sliced", "1/2 lb. hamburger", "1 can cream of mushroom soup", "1/4 can milk", "1 onion", "1 can onion rings"]
["Brown hamburger and onion.", "Drain. Heat milk and soup until smooth.", "Put hamburger and potatoes in casserole.", "Pour soup mixture on top.", "Put onion rings on top.", "Bake at 375\u00b0 for 1 hour."]
["potatoes", "hamburger", "cream of mushroom soup", "milk", "onion", "onion rings"]