Bill Knapp's Au Gratin Potatoes--quite a nice adaptation.
This is not my recipe, but it goes credit to a fellow named Mark on his blog when I was search for the a recipe to closely replicate those DELICIOUS potatoes.
I did a search for their chocolate cake, but the results did not seem that good to me, so i never bothered.
Here is the recipe and it is quite good.
KNAPP'S AU GRATIN POTATOES
1 1/2 lbs Russet Potatoes
2 cps Milk
1/2 cp Butter
1/2 tsp Salt
1/4 cp Flour
1 tsp Paprika
1/4 tsp Pepper
1 tsp instant Chicken Bullion granules
6 oz Velveeta Cheese
Night before, boil potatoes until easily pierced with fork, approx. 1/2 hour. Chill thoroughly. Next day, peel potatoes and cut into 1/2" cubes. Set aside. Melt Butter in a large sauce pan, add Salt and Flour and blend. Gradually stir in Milk and cook, stirring, till thickened. Add Paprika, Pepper, Bullion and Cheese. Cook, stirring, till cheese melts. Stir in Potatoes. Pour into greased casserole dish and bake, uncovered at 350 for about 1/2 hour, or until top start to get brown and bubbly.
Note: If you double this recipe, it fits nicely in a greased 9 x 13 pan. You can also divide this into individual cassolettes and bake, which is how Knapp's served it.