Crustless Pizza
["2 lb. ground beef", "1 large onion", "1 can sliced mushrooms", "1 jar spaghetti sauce", "2 c. shredded Mozzarella cheese", "2 Tbsp. margarine"]
["Brown ground beef. Drain meat and mix with spaghetti sauce. In separate pan, cook chopped onions and mushrooms in butter until onions are clear. Then add to the meat mixture. Layer meat mixture and cheese, ending with ground beef. Bake at 350\u00b0 until cheese is melted."]
["ground beef", "onion", "mushrooms", "spaghetti sauce", "Mozzarella cheese", "margarine"]