Cook sauce on low until smooth and boiling, stirring occasionally with a whisk.
6 Reduce heat and stir in cheese.
7 Place a half of the sliced potatoes in a lightly greased one quart casserole dish.
8 Pour half of cheese sauce over potatoes.
9 Repeat with second layer of potatoes and cheese sauce.
10 Sprinkle the remaining cheese on top.
11 Top with some paprika for color.
12 Bake uncovered for about 1 hour at 350°F