1 1/2 lbs lean ground beef
1 small yellow onion, chopped
1 pkg (16-oz) shredded mozzarella cheese
2 cans (15-oz each) pizza sauce
1 can cream of mushroom soup - do not dilute
1 pkg (8-oz) sliced pepperoni
Cook the pasta according to the package directions; drain in a colander.
While the pasta cooks, place the beef and onion in a large skillet and cook until meat is no longer pink. Stir often during cooking to break up the beef. Drain meat and onion well in a colander.
Place the pasta in a 5 or 6-quart slow cooker; stir in the beef and onion mixture. Add the remaining ingredients and stir to mix well.
Place lid on cooker and cook on low for approximately 3 hours or until heated through.
Yield: About 12 servings
Source: This is my version of a recipe I saw in a Holiday Book many years ago. The picture is from TOH.