Pierogi Casserole
["1 lb. elbow macaroni, cooked", "1 lb. American cheese (may use 1/2 American and 1/2 Cooper sharp)", "5 to 6 medium potatoes, cooked and mashed", "1/2 lb. margarine", "1/2 lb. butter", "onions to taste"]
["Saute onions with butter and margarine.", "Put 1/2 into bottom of dish.", "Layer macaroni, cheese and potatoes (2 layers).", "Top with rest of onion mix.", "Bake 45 minutes at 350\u00b0."]
["elbow macaroni", "American cheese", "potatoes", "margarine", "butter", "onions"]