Preheat oven to 350°F. Wash, peel and thinly
slice potatoes. Put them in a bowl and cover with cold water.
In a saucepan over low heat melt butter. Add flour gradually to make
a roux, stirring constantly. Gradually add milk, making sure that
the sauce does not become lumpy. Add salt and pepper and increase
heat to medium, stirring until the sauce thickens (about 5 minutes).
Remove from heat. Drain and then layer the potatoes in a 9 x 13-inch
glass baking dish, covering each layer with sauce.
Sprinkle grated cheese over the top of the casserole. Bake, loosely
covered with foil, for 30 minutes. Uncover and bake an additional
45 minutes. Let stand 5 minutes before serving.
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