Dauphinoise Potatoes – Creamy, Garlicky and Foolproof

1 What Are Dauphinoise Potatoes?

Dauphinoise potatoes – or gratin dauphinois, to give the dish its full French name – are thinly sliced raw potatoes baked slowly in cream until they are soft enough to cut with a spoon, with a golden, slightly crisp top. The dish comes from the Dauphiné, a historic region in south-eastern France running from the Rhône valley up into the Alps around Grenoble.

It’s an old recipe, too. The first written record of it dates back to July 1788, when it was served at a dinner given by the Duke of Clermont-Tonnerre, lieutenant-general of the Dauphiné, for the officials of the town of Gap. Nearly 240 years later, it’s still one of the finest things you can do with a potato.

The classic version is beautifully simple: potatoes, cream, garlic, salt and pepper. No cheese – that’s the sister dish from neighbouring Savoie – and no stock or onions, which would take you into boulangère territory. I think that simplicity is the whole point. With so few ingredients, each one has to be right, and the technique matters more than you might expect.

2 Choosing and Slicing the Potatoes

The best potatoes for dauphinoise

You want a floury potato. Maris Piper or King Edward are ideal in the UK (Russets if you’re in the US). Floury potatoes release starch into the cream as they cook, which thickens the sauce and – crucially – helps hold it together. Waxy potatoes such as Charlotte or new potatoes hold their shape too well and don’t give up their starch, so you end up with firm slices sitting in thin cream. The potatoes I used were organic, from Wylde Market, and they were excellent.

Don’t rinse the slices

Many potato recipes tell you to rinse or soak your slices. Please don’t do it here. That cloudy starch on the surface of the potato is your friend – it’s what turns the cream into a silky sauce and acts as a stabiliser against splitting. Slice the potatoes just before you need them and they won’t have time to discolour.

Why I use a mandoline

I use a mandoline for my dauphinoise, and I’d recommend you do the same. The single biggest cause of an uneven gratin is uneven slicing: thick slices stay firm while thin ones collapse to mush. A mandoline set to 2–3mm (about ⅛ inch) gives you identical slices in a couple of minutes, which means every layer cooks at the same rate. You can do it with a sharp knife, but it takes a steady hand and a lot longer.

A word of warning, though – I’ve seen plenty of people cut themselves on a mandoline, and it’s almost always on the last few slices when the potato gets small. Use the hand guard that comes with it, or a cut-resistant glove, and when the potato gets too small to hold safely, stop and slice the last bit with a knife.

3 Cream, Milk or Both?

This is the question I get asked most about dauphinoise, and you’ll find recipes that use everything from all double cream to mostly milk. Here’s how I see it.

All double cream is the richest, most luxurious version and the most forgiving. Double cream is around 48% fat, and that fat protects it from splitting in the oven. The downside is that it’s very rich – lovely alongside something lean, a bit much next to duck or pork belly.

Double cream with some whole milk is what I now recommend, and it’s what’s in the recipe below: roughly three parts double cream to one part whole milk. You get a slightly lighter, more pourable sauce that soaks into the potatoes, while the overall fat content stays high enough to keep things stable.

Single cream, or mostly milk – I wouldn’t. Single cream is only around 18% fat and milk far less, and the lower the fat, the more likely the sauce is to curdle into grainy little flecks in the oven. If you want a lighter dish, use less of the sauce rather than a thinner one.

Whatever you use, make it full-fat and as fresh as possible. Cream close to its use-by date is noticeably more prone to splitting.

4 How to Stop Dauphinoise Potatoes from Splitting

I’ll be honest: mine has occasionally been right on the edge, with a little slick of butterfat creeping round the sides of the dish. Split cream won’t hurt you, and the dauphinoise will still taste good, but it doesn’t look great and you lose that velvety texture. These are the things that make the difference.

Keep the oven moderate. This is the big one. If the oven is too hot, the cream boils hard around the edges of the dish, the proteins tighten and the fat breaks out. A moderate oven – 160°C fan – and a longer cook is far safer than blasting it. If you need to cook it hotter because something else is in the oven, keep it covered for longer.

Cover it for the first half. Foil over the dish for the first 45 minutes lets the potatoes steam and soften in the cream without the liquid bubbling away. Take it off for the second half to get the golden top.

Use enough liquid. If there isn’t enough cream, it reduces too far, and once most of the water has gone the fat has nowhere to go but out. The cream should come up to just below the top layer of potato when you press it down.

Keep the starch. As above – don’t rinse the slices. The potato starch thickens and stabilises the sauce.

Don’t start fridge-cold. You don’t need to heat the cream in a pan, but I do take it out of the fridge 20–30 minutes before I start. Fridge-cold cream takes longer to come up to temperature, which means the edges of the dish are bubbling away while the middle is still cool. The same goes if you’ve assembled the gratin in advance – get the dish out of the fridge half an hour before it goes in the oven, or add an extra 15 minutes to the covered stage.

Keep acid out. Wine, lemon or anything acidic will curdle cream. Dauphinoise doesn’t need any of it.

If it does split, don’t panic. Take it out of the oven and let it rest for 10–15 minutes – as it cools slightly, the potatoes often reabsorb some of the fat. Tilt the dish and spoon off any obvious excess. It won’t win a beauty contest, but it will still be delicious.

5 Make-Ahead, Storage and Reheating

As I said at the top, this is one of my go-to dinner party dishes, and there are two ways to get ahead with it.

Assemble it raw, bake it later. Layer everything up, pour over the cream so the potatoes are fully covered (any slice poking above the cream will discolour), cover the dish and keep it in the fridge for up to a few hours. Take it out half an hour before it goes in the oven, then bake as normal.

Bake it completely, then reheat. This is what many restaurants do, and I think the result is even better. Bake it fully, let it cool, then cover and refrigerate. Once it’s cold it firms up, and you can cut it into neat squares or rounds – that’s the trick behind those perfect portions you see on the plate.

To reheat, cover the dish with foil and warm through in the oven at 160°C fan (180°C conventional / Gas 4 / 350°F) for 20–25 minutes, uncovering for the last few minutes to re-crisp the top. Individual portions can go on a lined baking tray and take around 15 minutes.

Leftovers keep in the fridge, covered, for up to two days. I don’t recommend freezing: the cream can separate as it thaws and the potatoes turn watery and grainy, but having said that I have frozen the odd portion and it eats fine.

6 What to Serve with Dauphinoise Potatoes

As I mentioned at the top, dauphinoise really comes into its own next to slow-cooked meat, and the two dishes I keep coming back to are a beef bourguignon and a slow-roasted lamb joint – both oven dishes, both largely hands-off, and all three can share the oven while you talk to your guests. It’s also what I first made this version for, alongside my duck legs in red wine, and I still don’t think there’s a better match.

Beyond those, it works beautifully with anything that brings a sauce or a jus to the plate:

Slow-cooked beef – my slow-cooked beef brisket as an alternative to roast potatoes, or beef short ribs in red wine. Oxtail and shin of beef are just as good.

Lamb – a rack of lamb or slow-roasted shoulder. The garlic in the gratin and the lamb are natural partners.

Steak – a ribeye with a peppercorn sauce and dauphinoise is proper bistro territory, and easier to pull off at home than most people think.

Game – venison, pheasant or partridge. Rich, lean meat and cream is a classic combination through the autumn and winter.

Roast chicken – less obvious, but a good free-range bird with plenty of pan juices is lovely with it.

Christmas gammon or ham – a nice change from the usual roast potatoes on the big day.

Whatever you serve it with, keep the vegetables simple and green. Fine green beans, buttered cavolo nero, tender stem broccoli, wilted spinach or a crisp green salad with a sharp dressing all cut through the cream. You really don’t need another potato on the plate – and I’d resist adding one.

7 Variations

Cheesy dauphinoise – scatter a handful of grated Gruyère or Comté over the top for the last 20 minutes. Not strictly traditional, but hard to argue with.

Herb-infused – if you want thyme or bay in there, this is the one time it’s worth putting the cream in a pan: warm it gently with a couple of sprigs of thyme and a bay leaf, let it sit for ten minutes, then strain and let it cool a little before pouring.

Nutmeg – a little freshly grated nutmeg stirred into the cream is a classic French touch.

Truffle dauphinoise – a few drops of truffle oil in the cream, or shavings of fresh truffle between the layers if you’re feeling flush. I spotted truffle dauphinoise on a pub menu in Shepherd Market, which tells you how far this dish has travelled.

Potato and celeriac – swap a third of the potatoes for thinly sliced celeriac for an earthy, slightly sweet version that’s lovely with game.

8 Tips for Perfect Dauphinoise Potatoes

Season every layer – a single seasoning at the top is never enough. This is where most people go wrong.

Press it down – after pouring over the cream, press the potatoes down firmly with the back of a spatula so every slice is coated.

Rest before serving – 10–15 minutes out of the oven lets the sauce settle and thicken, and makes it far easier to portion.

Test with a knife – it’s done when a knife slides through every layer, from top to bottom, with no resistance at all.

9 Frequently Asked Questions

Should I use cream or a mix of milk and cream for dauphinoise potatoes?

Either works, as long as cream does most of the work. I use about three parts double cream to one part whole milk, which gives a lighter sauce that still resists splitting. All double cream is richer and even more forgiving; single cream or mostly milk is much more likely to curdle.

Why have my dauphinoise potatoes split?

Usually one of three things: the oven was too hot, there wasn’t enough fat in the sauce (too much milk or single cream), or the liquid reduced too far. Cook at a moderate 160°C fan, keep it covered for the first half, and make sure the cream comes almost to the top layer.

Can I fix split dauphinoise?

Not completely, but you can rescue it. Rest it for 10–15 minutes so the potatoes reabsorb some of the fat, then tilt the dish and spoon off any excess. It will still taste very good.

Do I need to heat the cream before pouring it over?

No. Some recipes simmer the cream first, but that’s mainly to infuse garlic or herbs into it – and this recipe puts the garlic straight between the layers. I simply take the cream and milk out of the fridge 20–30 minutes before I start, so they aren’t stone cold going into the oven.

What are the best potatoes for dauphinoise?

Floury potatoes such as Maris Piper or King Edward (Russets in the US). Their starch thickens and stabilises the cream. Avoid waxy and new potatoes.

Should I rinse the potatoes before making dauphinoise?

No. The surface starch helps thicken the sauce and stops it splitting. Slice the potatoes just before you layer them so they don’t discolour.

How thin should the potatoes be for dauphinoise?

Around 2–3mm (⅛ inch). A mandoline is the easiest way to get them even – just use the hand guard.

Can I assemble dauphinoise in advance and bake it later?

Yes, and it’s how I usually handle a dinner party. Layer it up, pour over the cream so no potato is left exposed, cover and refrigerate for up to a few hours. Take it out of the fridge half an hour before baking, or add an extra 15 minutes to the covered stage.

Can I make dauphinoise potatoes the day before?

Yes, and it’s arguably better. Bake it fully, cool, cover and chill, then reheat covered at 160°C fan for 20–25 minutes. Cold dauphinoise also cuts into beautifully neat portions.

Can you freeze dauphinoise potatoes?

I wouldn’t. The cream tends to separate on thawing and the potatoes go watery. It keeps well in the fridge for up to two days.

Do dauphinoise potatoes have cheese in them?

Traditionally, no. A classic gratin dauphinois is just potatoes, cream and garlic. Adding Gruyère to the top is a popular variation and closer to the Savoyard style.

What’s the difference between dauphinoise and boulangère potatoes?

Dauphinoise is cooked in cream; boulangère is cooked in stock with sliced onions. Boulangère is lighter and crisper; dauphinoise is richer and softer. The name boulangère comes from the tradition of taking the dish to the local baker’s oven to cook.

Are dauphinoise potatoes the same as scalloped potatoes or potatoes au gratin?

They’re close relatives. Scalloped potatoes in the US are often made with a flour-thickened sauce, and potatoes au gratin usually include cheese. Dauphinoise uses raw potatoes baked in cream alone, with the potato starch doing the thickening.

How long do dauphinoise potatoes take to cook?

About 1½ hours at 160°C fan for a dish made with 1kg of potatoes – 45 minutes covered, then 45 minutes uncovered. A shallower dish will be quicker, a deeper one slower, so always check with a knife.

Can I cook dauphinoise at a higher temperature alongside a roast?

You can – it will cook at 180°C fan, as mine did alongside the duck legs. Keep it covered for longer and check it from about an hour, as the higher heat increases the risk of the cream splitting at the edges.

10 Dauphinoise Potatoes Recipe – Ingredients and Method

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Serves: 4–6 as a side

Prep time: 20 minutes

Cooking time: 1 hour 30 minutes, plus 10–15 minutes resting

Level: Easy

Ingredients

1kg (2.2lb) floury potatoes, such as Maris Piper or King Edward

450ml (scant 2 cups) double cream (heavy cream), at room temperature

150ml (⅔ cup) whole milk, at room temperature

2 garlic cloves – 1 halved for rubbing the dish, 1 finely chopped

25g (2 tbsp) butter, plus extra for greasing

Sea salt and freshly ground black pepper

Freshly grated nutmeg (optional)

Method

Prepare the dish

Take the cream and milk out of the fridge 20–30 minutes before you start. Preheat your oven to 160°C fan / 180°C conventional / Gas 4 / 350°F.

Halve a garlic clove and rub the cut side firmly all around the inside of a baking dish, roughly 20 x 30cm (8 x 12 inches). Then grease the dish generously with butter.

Mix the cream

Pour the double cream and milk into a jug, add a good pinch of salt and a little nutmeg if using, and stir to combine. There’s no need to heat it.

Slice the potatoes

Peel the potatoes and slice them 2–3mm (⅛ inch) thick, ideally on a mandoline using the hand guard. Don’t rinse them – the starch helps thicken the sauce and stops it splitting.

Layer it up

Arrange a layer of overlapping potato slices in the dish. Season with salt and pepper and scatter over a little of the chopped garlic. Repeat, seasoning every layer, until all the potatoes are used, finishing with a neat top layer.

Add the cream

Pour the cream mixture evenly over the potatoes, letting it find its way between the layers. Press the potatoes down firmly with a spatula – the cream should come up to just below the top layer. Dot the top with the butter.

Bake

Cover the dish with foil and bake for 45 minutes. Remove the foil and bake for a further 45 minutes, until the top is deep golden and a knife slides through every layer with no resistance. If the top is browning too quickly, lay the foil loosely back over.

Rest and serve

Let the dauphinoise rest for 10–15 minutes before serving so the sauce can settle and thicken.