In a medium-size saucepan, melt butter over medium heat. Mix
in the flour and salt, and stir constantly with a whisk for one
minute. Stir in milk. Cook until mixture has thickened. Stir in
cheese all at once, and continue stirring until melted, about 30
to 60 seconds. Pour cheese over the potatoes, and cover the
dish with aluminum foil.
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