Prepare the potatoes

• Peel the potatoes and slice them into thin, even rounds.
• Keep the slices in a bowl of cold water so they do not brown.

Make the creamy mixture

• Pour the cream and milk into a saucepan with the minced garlic.
• Season with salt, pepper and nutmeg and warm gently without boiling.

Layer the gratin

• Grease the baking dish with butter.
• Arrange the potato slices in overlapping layers.
• Pour the warm cream mixture over the potatoes and scatter the grated cheese on top.

Bake the gratin

• Bake until the potatoes are tender and the top is golden and bubbling.
• Let it rest a few minutes before serving.