Start by chopping a small onion and half a green pepper.
Brown 1 pound of lower fat ground beef over medium high heat. Add one small chopped medium onion after a couple of minutes Cook for about 8 minutes until no pink left. Add two cloves of crushed garlic the last minute of browning. About 8 minutes total.
Add 1 – 28 oz can crushed tomatoes, 1 cup water, 4 oz of sliced pepperoni minus 12 slices for topping, two tsp oregano, two tsp salt, one tsp pepper, 1/2 chopped green pepper, 1 cup mozzarella cheese to a smaller crock pot. I used 3 1/2 qt. Mix well. Add 2 cups uncooked pasta. Mix well. Helpful hint: separate the pepperoni as it goes in.
Add the cooked ground beef after draining fat.
Top with 1 cup mozzarella and the 12 slices of pepperoni.
Cook on low for approximately 5 hours until edges browning nicely.