Ingredients
Method
Preparation
- Preheat the oven to 375°F (190°C) and butter a 9x13-inch baking dish.
- Arrange half of the sliced potatoes in an even layer across the bottom of the dish.
- Whisk together the heavy cream, milk, minced garlic, salt, pepper, and nutmeg in a bowl until combined.
Assembly
- Pour half of the cream mixture over the first potato layer and sprinkle half of the Gruyère and Parmesan on top.
- Repeat with the remaining potato slices, pour the rest of the cream, and finish with the remaining cheeses.
- Dot the top with small pieces of unsalted butter.
Baking
- Cover the dish tightly with foil and bake for 45 minutes.
- After 45 minutes, remove the foil and return the dish to the oven for 15 more minutes or until the top turns golden.
- Let the gratin rest for 5–10 minutes before serving.
Notes
For extra tips, use a mandoline to slice potatoes and ensure even cooking. If the sauce looks watery after resting, bake uncovered for a few minutes longer to concentrate it.
