01 -
Preheat the oven to 190°C and grease a baking dish thoroughly with unsalted butter.
02 -
Wash and peel the potatoes, then cut into thin rounds approximately 3 mm thick to ensure even cooking.
03 -
Combine heavy cream with minced garlic, salt, and black pepper in a bowl, mixing until well incorporated.
04 -
Arrange a layer of potato slices in the baking dish, sprinkle with grated Gruyère cheese, then drizzle with the cream mixture. Repeat layers until all ingredients are used.
05 -
Cover the baking dish with aluminum foil and bake in the preheated oven for 45 minutes.
06 -
Remove the foil and continue baking for an additional 15 to 20 minutes until the top is golden brown and bubbling.
07 -
Let the gratin cool for a few minutes to stabilize before serving.