Pizza Pasta Casserole

• 1 pound ground beef
• 1/2 onion chopped
• 1 jar spaghetti sauce
• 1/2 package 16 oz. spiral pasta cooked and drained
• 2 cups shredded mozzarella cheese
• 4 ounces sliced pepperoni

In a large skillet, cook beef and onion until meat is no longer pink; drain. Stir in spaghetti sauce and pasta. Transfer to a greased 13x9x2" baking dish. Sprinkle with cheese. Arrange pepperoni over the top. Bake uncovered at 350 degrees for 25-30 minutes.