White russet potatoes will also work if you tolerate them. Orange fleshed sweet potatoes will also work but will make this a little sweeter. I use ghee in this for the buttery flavor, but it does have trace amounts of lactose and casein. To make this dairy-free, substitute avocado oil in place of the ghee. Tapioca starch will make this sauce more “stretchy” like real cheese, but we tolerate arrowroot better.