3 tbsp. butter or fat
2 tbsp. flour or cornstarch
1 c. milk
3/4 tsp. salt
2 c. sliced potatoes
1/2 c. buttered bread crumbs; optional

Combine butter, flour, milk and salt; cook until thickened. Arrange alternate layers of potatoes and sauce is greased casserole. Cover with buttered crumbs. Bake uncovered at 350 degrees for 1 hour. Yields 6 servings.