I make scalloped potatoes and hash brown casserole all the time but this was different. And, it was so good, I have to make it again! I might be making this for New Year's when I make our traditional Prime Rib Roast!
I was lucky that I was able to use some of our last homegrown potatoes in the recipe. Here is the how I made it.
heavy cream (about a 2/3 of a cup although I added it until it covered the potatoes)