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Wash and thinly slice the potatoes. Aim for even slices to ensure they cook uniformly. A mandoline slicer can help create thin, even slices, but a sharp knife will work just as well.
Assemble the Layers
Start by layering the potatoes in a single layer at the bottom of a greased casserole dish. Add a layer of meatballs on top, then cover with a thin layer of the creamy sauce. Repeat this process, finishing with a layer of sauce.
Bake
Cover the casserole with foil and bake at 375°F (190°C) for about 45 minutes. Remove the foil, sprinkle with cheese if desired, and bake for an additional 15 minutes until the cheese is bubbly and golden and the potatoes are tender.
Serve and Enjoy
Allow the casserole to cool for 10 minutes before serving. This helps the layers set and makes slicing easier.
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