The recipe says to use Velveeta cheese. DO NOT USE THE GENERIC!!!! Trust me! I'm not going to give you the details on why I no longer buy generic processed cheese. Just trust me.
My mom used to make really great Au Gratin Potatoes and people would ask her to make them for potlucks and other functions. She never taught me how to make her potatoes and then she changed her recipe and started using boxed mixes to sped the process up and I no longer wanted her recipe. I searched and searched for a recipe like hers and combined 3 recipes to make my own version and I think my version is WAY better than I remember my mom's being. Enjoy!!
1/2 teaspoon pepper