I think this adaptation of Julia Child's Sausage and Potato Casserole, or Gratin de Pommes de Terre et Saucisson, I found over at Black Fox Homestead must be simplicity at it's best.
I did not look up the original recipe, which came from The French Chef, but followed the adaptation exactly, with one minor exception. I did add about 2 tablespoons of shredded cheese to the cream mixture. The only explanation there is that it seemed like the right thing to do. Also because I was in a hurry and my pie dish is difficult to dig out, I did opt to use a large shallow casserole dish instead. It did not seem like the right thing to do, but it worked out anyway. Pretty sure this will become a recipe that makes its way into the regular rotation.