Preheat the Oven:
Preheat your oven to 350°F (175°C). Grease a large baking dish (about 9×13 inches) with butter.
Prepare the Potatoes:
Peel and thinly slice the potatoes using a sharp knife or a mandoline for even slices.
Make the Cream Mixture:
In a saucepan, combine the heavy cream, milk, minced garlic, salt, pepper, and nutmeg. Heat over medium heat until the mixture is warm and well combined, but do not let it boil.
Layer the Potatoes:
Arrange a layer of the sliced potatoes at the bottom of the prepared baking dish. Pour a little of the cream mixture over the potatoes and sprinkle with a small amount of Gruyère cheese.
Continue Layering:
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