Pierogie Casserole
["4 sticks butter", "3 lg. onions, chopped", "9-12 lasagna noodles", "Mashed potatoes", "1 lb. cheddar cheese, shredded"]
["Saute onions and butter. Cook noodles as directed and cool. Prepare mashed potatoes and add some cheese to the potatoes. On bottom of a 9 x 12-inch pan, place a layer of onion and butter, a layer of noodles, then potatoes, then onions and cheese. Repeat layers 3 or 4 times. Bake at 350\u00b0 for 1 hour. (Egg noodles may be substituted for lasagna noodles.)"]
["butter", "onions", "lasagna noodles", "potatoes", "cheddar cheese"]