This dish goes by a lot of names: funeral potatoes, cheese potato casserole, au gratin potatoes. Growing up, they were just called "cheese potatoes," and they were my most requested dish.
I've made cheese potatoes several times over the years, but had never found a recipe that didn't require a can of condensed cream-of-something soup. Finally, I had the tremendously bright idea of emailing Mel from Mel's Kitchen Cafe (and supplier of Homemade Hawaiian Haystacks) whether she had a good recipe for cheese potatoes that didn't require canned soup. She promptly wrote back saying she would soon be trying such a recipe, and was kind enough to email it to me.
Over time, I altered the recipe a bit to taste more like the cheese potatoes I remember growing up. Let me tell you, it is pretty dang close to what mama used to make. And definitely worth not opening that can of soup.
Homemade Cheese Potato Casserole
(adapted from Mel's Kitchen Cafe)