Pizza Casserole

Pizza Casserole

1 small onion, diced
1 pound browned ground beef
1 can mushrooms
1 stick of pepperoni, sliced and diced
2 cans pizza sauce
2 cups mozzarella cheese, shredded

Mix all of the ingredients together in a casserole dish. Bake at 350F for 45 minutes. Serves 4.