Upside - Down Pizza
["1 lb. ground beef or sausage", "1 c. chopped onions", "15 oz. jar of pizza sauce", "1/4 lb. pepperoni, coarsely chopped", "1/2 tsp. Italian seasoning, optional", "2 oz. jar sliced mushrooms, drained", "2 c. shredded mozzarella cheese"]
["Heat oven to 400. In a skillet, brown meat and onions. Drain fat. Stir in pizza sauce, pepperoni, seasonings, and mushrooms. Bring mixture to a boil; reduce heat and simmer 15 minutes, stirring occasionally. Spoon into a greased 9 x 12 baking dish. Sprinkle cheese over hot mixture; set aside."]
["ground beef", "onions", "pizza sauce", "pepperoni", "Italian seasoning", "mushrooms", "mozzarella cheese"]