1/4 cup chopped onion

1/4 cup butter

1/4 cup all purpose flour

2 1/2 cups milk

5 large potatoes, peeled and thinly sliced

To make sauce, cook onion in butter until tender but not brown.  Stir in flour, 1 1/4 tsp salt and 1/8 teaspoon pepper.  Add milk. Cook and stir until thickened and bubbly.  Place half of the sliced potatoes in a greased 2 qt casserole.  Cover with half the sauce.  Repeat layers.  Bake covered in a 350 degree oven for 45 minutes stirring once.  Uncover and bake about 30 minutes more or until potaotes are done.  makes 4 - 6 servings.