Need Crock Pot Au Gratin Potato recipe that uses real cheese and milk?

Is it possible to make Potatoes Au Gratin in the crock pot using "real" ingredients? All the recipes I find seem to use velveeta cheese, or cheese soup. Will using real milk and real cheddar cheese cook well in a crock pot or will they curdle? Just can't figure out why the crock recipes seem to use soups. This is for Christmas dinner so I want them to be "real ingredients".