I've never done them in the crock, though the description which TreasureIt has given, sounds very similar to the "Night Before Potatoes" I do in the oven. The cheese is cream cheese and some sour cream as well. I do these when I entertain, as it saves that last minute mashing with potatoes up to your armpit! To say the least about the fussing while boiling, and the extra dishes.
I'm sure the recipe would work just fine in the crock pot. Let Google beyour friend and you will have more than enough crockpot possibilities to keep you going for quite awhile!