Pizza Pasta Casserole

Pizza Pasta Casserole
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2 pounds ground beef
1 large onion, chopped
2 jars (28 ounces each) spaghetti sauce
1 package (16 ounces) spiral pasta, cooked and drained
4 cups (16 ounces) shredded mozzerella cheese
8 ounces sliced pepperoni
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In a large skillet, cook beef and onion until meat is no longer pink; drain. Stir in spaghetti sauce and pasta. Transfer to two greased 13 in x 9 in x 2 in baking dish. Sprinkle with cheese. Arrange pepperoni over the top. Cover and freeze one casserole for up to three months. Bake the second casserole, at 350 degrees for 25-30 minutes or until heated through. To use frozen casserole: Thaw in the refrigerator overnight. Bake at 350 degrees for 35-40 minutes or until heated through.