Popover Pizza
["1 lb. ground chuck", "1 large onion, chopped", "1 to 1 1/2 oz. envelope spaghetti sauce", "1/2 c. water", "1 (8 oz.) pkg. shredded Mozzarella cheese", "2 eggs", "1 c. milk", "1 Tbsp. vegetable oil", "1 c. all-purpose flour", "1/2 tsp. salt", "1/2 c. grated Parmesan cheese"]
["Brown beef and onions; drain.", "Stir in sauce mix, tomato sauce and water.", "Simmer 10 minutes.", "Spoon into greased 13 x 9-inch pan.", "Top with cheese.", "Beat eggs, milk and oil until foamy.", "Beat in flour and salt until batter is smooth.", "Pour over filling and cover.", "Sprinkle Parmesan cheese and bake at 400\u00b0 for 30 minutes.", "Cut in squares."]
["ground chuck", "onion", "spaghetti sauce", "water", "Mozzarella cheese", "eggs", "milk", "vegetable oil", "flour", "salt", "Parmesan cheese"]