Creamy French Potato Gratin (Gratin Dauphinois)

1 h 20 min | intermediate | clean eating, gluten-free

Close-up of a square serving of potato gratin on a white plate, showing thin layers of potatoes in creamy sauce with a browned, bubbly Gruyère crust on top.

Recipe by Eunice Published Mar 8, 2026

Prep Time	Cook Time	Total Time
20 min	1 h	1 h 20 min

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Introduction

This creamy French potato gratin, also known as gratin dauphinois, layers tender potatoes in a rich, garlicky cream sauce.

It’s an elegant yet cozy side dish that’s perfect for holidays, dinner parties, or pairing with a simple roast on weeknights.

Square serving of creamy potato gratin on a white plate, showing thin layers of potatoes in a rich sauce with a deeply browned, bubbly Gruyère top on a marble surface.

How to Make Creamy French Potato Gratin (Gratin Dauphinois)

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Preheat the oven and prepare the baking dish

Preheat your oven to 350°F with a rack in the center position.
Grease a 2-quart baking dish with the butter, making sure to coat the bottom and sides evenly.
Set the dish on a rimmed sheet pan to catch any bubbling cream while baking.
Slice the potatoes

Peel the potatoes if needed, then rinse and pat them very dry with paper towels.
Using a mandoline or sharp knife, slice the potatoes into very thin rounds, about 1⁄8 inch thick.
Keep the slices in neat stacks to make layering easier, and do not rinse away the surface starch.

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Warm the cream with garlic and seasonings

In a small saucepan, combine the heavy cream, minced garlic, salt, pepper, and nutmeg.
Heat over medium-low just until steaming and small bubbles appear around the edges, then turn off the heat.
Do not let the cream boil, which can cause it to separate and thicken too much in the oven.
Layer the potatoes and cream

Arrange a layer of potato slices in the prepared dish, slightly overlapping them in tight rows.
Season lightly with a small pinch of salt and pepper if you like a very savory gratin.
Ladle some of the warm cream mixture over the potatoes, just enough to barely cover that first layer.
Repeat with more potatoes and cream, making 3 or 4 layers, and finishing with a generous layer of cream on top.
Top with Gruyère

Sprinkle the grated Gruyère evenly over the surface, breaking up any clumps for even melting.
If the cheese browns too quickly, you can tent the dish loosely with foil during baking.

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Bake the gratin

Bake the gratin for 55 to 65 minutes, until the top is deep golden and the cream is bubbling.
Test doneness by piercing the center with a thin knife, which should slide through the potatoes with no resistance.
If the top browns before the potatoes are tender, cover loosely with foil and continue baking until fully soft.
Rest and serve

Let the gratin rest for at least 15 minutes so the creamy layers can set before scooping.
Serve warm in generous spoonfuls, making sure each portion includes plenty of golden cheese and tender potatoes.
For a classic bistro touch, finish with a light sprinkle of chopped fresh chives or parsley.

Substitutions

Gruyère cheese -> Comté or Emmental: Comté or Swiss Emmental melt similarly to Gruyère and keep the nutty, slightly sweet flavor that balances the rich cream.
Heavy cream -> Half-and-half with extra butter: Use half-and-half and add one extra tablespoon of butter for each cup to mimic the same silky texture. Bake at 325°F and watch closely, since lower fat mixtures can separate more easily than heavy cream.
Yukon Gold potatoes -> Russet potatoes: Russets create a slightly fluffier, almost soufflé-like center, while still soaking up the garlicky cream beautifully. Slice them gently, since they are more fragile, and avoid rinsing so the starch can help thicken the sauce.

Tips

Use a mandoline for even slices: Uniform slices cook at the same rate, which prevents some layers from turning mushy while others stay underdone.
Do not skimp on resting time: Resting lets the starch set the sauce, so portions slice cleanly instead of sliding into a creamy puddle.
Salt carefully when using different cheeses: Some cheeses, especially aged Gruyère or Comté, are saltier, so taste the cream before adding extra salt to the dish.
Bake on a sheet pan for easy cleanup: Cream can bubble over as it simmers, and a sheet pan underneath protects your oven and simplifies cleanup.
Make ahead and reheat gently: Bake the gratin until just tender, cool completely, then refrigerate covered for up to two days. Reheat covered at 325°F until hot, then uncover briefly to refresh the browned, lightly crisp top.

Nutrition Facts ^*

Energy	425	kcal
Protein	8	g
Total Fat	31	g
Carbohydrates	30	g
Dietary Fiber	3	g

^* Approximate, per serving.
Data source: USDA FoodData Central.

FAQ

How can I stop the cream from curdling or separating?: Use full-fat heavy cream, and avoid boiling it on the stove before baking. Keep the oven temperature moderate and cover loosely with foil if the top browns long before the potatoes soften.
My potatoes are still firm after an hour; what went wrong?: Slices that are too thick can stay firm, so aim for about 1⁄8 inch and use a sharp blade. If the slices look right, cover the dish and bake 10 to 15 minutes longer, then test again with a knife.
Can I add other flavors like herbs or bacon?: Yes, but keep additions simple so they do not overpower the delicate cream, potato, and nutmeg combination. Try a little fresh thyme, or scatter crisp bacon bits over the top during the last minutes of baking.
How do I keep the top from burning while the inside finishes cooking?: If the cheese is browning fast, tent the dish loosely with foil so steam can escape while shielding the surface. Move the dish to a lower oven rack, which slows browning while the center continues to cook.