1 lb. ground beef
1/4 c. chopped onion
1/2 tsp. salt
1/4 tsp. pepper
4 c. thinly sliced potatoes
1 can cheddar cheese soup
1/2 c. milk
8 oz. tomato sauce
1/2 tsp. oregano
grated mozzarella cheese
parmesan cheese

Brown hamburger. Add onion, salt, and pepper, set aside. Mix potatoes, cheese soup, and milk in a baking dish. Top with hamburger mixture. Mix tomato sauce and oregano and put on top of hamburger mixture. Bake, covered at 350° for 1 hour. Remove cover and top with cheeses and return to oven to melt cheeses.