2. Once it's melted, add the potato starch and mix thoroughly until there are no lumps, allow it to thicken slightly by leaving it over the heat.
3. Add the milk all at once and immediately start stirring vigorously and combine the flour and butter mixture with the milk completely.
4. Let the mixture sit just until it starts to bubble, then add the cheese and stir until fully melted. Experiment with cheese varieties, I've found a combination of a mild cheese and a stronger flavored cheese makes for a really good sauce, or throw in some Pepperjack for some extra kick. Jarlsberg and Aged Gouda is one of my favorite cheese combinations.
5. Cook the pasta normally while the sauce simmers, and add the spices to taste. Serve piping hot with enough sauce to fully cover all of the noodles!