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In a small sauce pan, melt butter and blend in flour.
Let sit for a minute.
Add all of cold milk, stirring with a whisk.
Season with salt and cayenne.
Cook sauce on low until smooth and boiling, stirring occasionally with a whisk.
Reduce heat and stir in cheese.
Place a half of the sliced potatoes in a lightly greased one quart casserole dish.
Pour half of cheese sauce over potatoes.
Repeat with second layer of potatoes and cheese sauce.
Sprinkle the remaining cheese on top.
Top with some paprika for color.
Bake uncovered for about 1 hour at 350°F.