1 1/2 c. milk
2 tbsp. flour
2 tbsp. butter
1 tsp. salt
1/4 lb. grated cheese
4 c. cooked, diced potatoes
1 c. bread crumbs, buttered
1/4 c. chopped onion

Prepare sauce with milk, flour, butter and salt. Add onion and cheese and stir until melted. Place potatoes in a greased baking dish; pour cheese sauce over potatoes. Top with buttered bread crumbs and bake in moderate oven for 20 to 30 minutes or until golden brown.