Pepperoni Macaroni

2 1/2 cups macaroni
1 lb. ground beef
1 onion, chopped
1 can pizza sauce
8 oz. tomato sauce
1/3 cup milk
1 can sliced mushrooms, drained
1 can sliced black olives, drained
3 1/2 oz. sliced pepperoni, halved
1 cup shredded mozzarella cheese

Cook macaroni according to package directions. Meanwhile, in a skillet over medium heat, cook ground beef and onion until meat is no longer pink; drain. Drain macaroni. In a large bowl, combine pizza sauce, tomato sauce and milk. Stir in hamburger mixture, macaroni, pepperoni, mushrooms and olives. Transfer to a greased 13x9x2 baking dish. Cover and bake at 350ºF for 30 minutes. Uncover; sprinkle with cheese. Bake 10-15 minutes longer or until bubbly and cheese is melted.