Classic Potato Gratin (Creamy, Golden Dauphinoise)

A timeless, comforting side or simple main: thinly sliced potatoes baked in a garlic‑scented cream until tender, bubbling, and golden on top. This version balances creaminess with a crisp cheese crust and is easy enough for weeknights yet elegant for guests.

Prep & cook at a glance

• Prep time: 20–30 minutes
• Cook time: 50–65 minutes
• Rest time: 15–20 minutes
• Serves: 4–6

Ingredients

• 2 lb (about 900 g) starchy potatoes (Yukon Gold or Russet), peeled
• 2 cups (480 ml) heavy cream or a mix of 1 cup cream + 1 cup whole milk
• 2 large garlic cloves, crushed
• 1 tsp fine sea salt, plus more to taste
• 1/4 tsp freshly ground black pepper
• 1/8 tsp freshly grated nutmeg (optional, but recommended)
• 1 tbsp unsalted butter, for greasing
• 1 cup (about 100 g) grated Gruyère or sharp cheddar (reserve 1/4 cup for topping)
• 1 tbsp finely chopped fresh thyme or 1 tsp dried thyme
• 1 tbsp finely chopped chives or parsley for finishing (optional)

Equipment

• Sharp mandoline or chef’s knife
• 9 x 13-inch (or equivalent) baking dish
• Saucepan
• Aluminum foil (optional)

Method

1. Prepare the potatoes

1. Preheat the oven to 375°F (190°C).
2. Using a mandoline set to about 1.5–2 mm, slice the potatoes into even thin rounds. If using a knife, aim for uniform 1/8‑inch slices.
3. Place slices in a bowl of cold water for a few minutes to remove excess starch, then drain and pat dry with a clean kitchen towel or paper towels. Drying helps the cream cling and prevents a gluey texture.

2. Make the garlic cream

1. In a medium saucepan, warm the cream and milk (if using) over medium heat until it just begins to steam — do not boil.
2. Add the crushed garlic, salt, pepper, and nutmeg. Stir and remove from heat. Let the mixture infuse for 5 minutes, then remove the garlic (or leave it in for a stronger garlic flavor).

3. Assemble the gratin

1. Butter the baking dish with the tablespoon of butter, including the sides.
2. Arrange a single layer of potato slices on the bottom, slightly overlapping. Sprinkle a little thyme and a pinch of the grated cheese over the layer.
3. Repeat layering potatoes, thyme, and cheese until all potatoes are used, finishing with a layer of potatoes.
4. Pour the warm cream mixture evenly over the potatoes. Press the potato layers gently so the cream settles between slices.
5. Scatter the reserved 1/4 cup of grated cheese evenly across the top for a golden crust.

4. Bake

1. Cover the dish loosely with foil and bake for 35–40 minutes.
2. Remove the foil and continue baking for 15–25 minutes, until the top is golden and the potatoes are tender when pierced with a knife. Total baking time will be about 50–65 minutes depending on slice thickness and oven.
3. If the top browns too quickly, tent with foil for the remaining time.

5. Rest and serve

1. Remove from the oven and let the gratin rest for 15–20 minutes. Resting lets the cream set so you can cut neat slices.
2. Sprinkle with chopped chives or parsley before serving for color and brightness.

Tips for success

• For easiest slicing, chill potatoes for 30 minutes before using a mandoline. Always use the guard.
• Thinner slices cook more evenly; aim for uniform thickness.
• If you prefer a lighter dish, use half-and-half in place of heavy cream, but the gratin will be less rich.
• Make-ahead: assemble the gratin up to the point of baking, cover, and refrigerate for up to 24 hours. Add about 10–15 minutes to the baking time if baking straight from cold.
• Leftovers reheat well in a low oven (about 325°F / 160°C) until warmed through.

Variations

• Mushroom & Herb: Sauté 8 oz (225 g) sliced mushrooms in butter until browned and layer them between the potato slices.
• Ham & Gruyère: Add thin strips of cooked ham between layers for a heartier main.
• Dairy-free: Substitute full‑fat coconut milk and use a dairy-free cheese for a lactose‑free option (flavor will differ).

Serving suggestions

• Classic with roast chicken or pork.
• With a crisp green salad for a lighter no‑fuss dinner.
• As part of a holiday spread alongside roasted vegetables.

Enjoy the satisfyingly creamy interior and the golden, cheesy top — simple, reliable comfort food that’s worth making often.