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Preheat your oven to 350°F and grease a baking dish.
Peel and thinly slice the potatoes, about ¼-inch thick. Slice or dice the onion.
Shred the Cheddar cheese, preferably from a block for the best texture.
Notes
Use a mandoline or sharp knife to ensure even potato slices.
Grate the cheese yourself for a smoother, creamier texture.
Let the casserole rest for 5-10 minutes before serving to allow the sauce to thicken slightly.
Adjust the seasoning to your taste, adding more salt, pepper, or herbs as desired.
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