This potatoes au gratin recipe features thinly sliced potatoes baked in a rich and creamy cheese sauce that will have you craving more! This delicious casserole bakes beautifully in the oven where it forms a golden, cheesy crust on top, with gooey cheese layered underneath. Serve this casserole for family dinners, holiday meals, and more for a truly decadent and show-stopping side dish!