1 (16 oz.) box rotini
1 lg. can Hunt's spaghetti sauce
1 lg. ground beef
1 onion
1 pkg. cheddar cheese (8 oz.)
1 pkg. Mozzarella cheese (8 oz.)
1 pkg. pepperoni

Cook rotini as directed on box. Set aside. Brown ground beef and onion; drain excess grease and add spaghetti sauce. Mix ground beef mixture with rotini. In casserole dish layer rotini, pepperoni and cheese. Bake at 350 degrees until cheese melts.