Which cheddar cheese soup were you looking for?
Haven't tried the sweet potatoes with buttermilk. We usually bake them but I am the last in our home that really liked them.
I thought I read or heard that a Campbell cheese soup had been discontinued. I did a search and see that a local store does carry the Campbell cheese soup. It was called for in the crockpot scalloped potatoes in one of the recipes from that first link you gave.