The Side Dish That Became the Main Event
I originally made this gratin as a side dish for a Sunday roast chicken, and I will be honest — nobody really noticed the chicken. All anyone talked about, all afternoon, was the potatoes. Thin slices of potato layered with cream and melted Boursin, baked until the top turns golden and the inside goes impossibly silky. It is the kind of dish that silences a table, in the best possible way.
Traditional dauphinois is already a beautiful thing, but folding in Boursin — that soft, garlicky, herb-flecked French cheese — takes it somewhere else entirely. The cheese melts into the cream as it bakes, so every layer of potato is coated in something rich, savoury and faintly tangy. It tastes as though the potatoes have been quietly marinating in flavour all along. I have since made it for dinner parties, for Christmas, and once just for myself on a rainy Tuesday, and it has never once disappointed.
Why You’ll Love This Recipe
- Unbelievably creamy layers. The Boursin melts into the cream so every paper-thin slice of potato is wrapped in velvet.
- Effortless elegance. It looks like something from a French bistro but takes about twenty minutes of actual effort.
- A guaranteed crowd-pleaser. I have yet to serve this to anyone who did not ask for the recipe before dessert arrived.
- Make-ahead friendly. Assemble it in the morning, refrigerate, and bake when you are ready — perfect for entertaining.
- Endlessly adaptable. Swap the herbs, add a layer of caramelised onions, or top with extra Gruyère — it welcomes tinkering.
Ingredients
Serves 6 as a generous side — easily doubled for a crowd
For the gratin:
- 1.2kg floury potatoes, such as Maris Piper or King Edward, peeled
- 2 x 150g packs Boursin garlic and fine herbs cheese
- 400ml double cream
- 200ml whole milk
- 2 garlic cloves, lightly crushed
- 30g butter, plus extra for greasing
- 1 teaspoon fine sea salt
- Half a teaspoon freshly ground black pepper
- A good grating of fresh nutmeg
- 40g Gruyère, finely grated (optional, for the top)
Instructions
- Step 1 — Heat the oven. Preheat to 180C (160C fan) and butter a large baking dish generously, rubbing it all over with a cut garlic clove for extra flavour.
- Step 2 — Slice the potatoes thinly. Using a mandoline or a very sharp knife, cut the potatoes into slices about 2 to 3mm thick. Keep them uniform so they cook evenly.
- Step 3 — Warm the cream. Gently heat the cream and milk with the crushed garlic until steaming, then whisk in the Boursin until it melts into a smooth, fragrant sauce. Season with salt, pepper and nutmeg.
- Step 4 — Layer the potatoes. Arrange a third of the potato slices in overlapping layers in the dish, seasoning lightly as you go.
- Step 5 — Add the sauce. Pour over a third of the warm Boursin cream, spreading it so it settles between every slice.
- Step 6 — Repeat the layers. Continue layering potatoes and sauce twice more, finishing with a final pour of sauce that just covers the top layer.
- Step 7 — Dot with butter. Scatter small knobs of butter over the surface and, if you like, the grated Gruyère for an extra golden crust.
- Step 8 — Bake covered. Cover loosely with foil and bake for 40 minutes, letting the potatoes steam and soften in the creamy sauce.
- Step 9 — Bake uncovered. Remove the foil and bake for a further 25 to 30 minutes until the top is deeply golden and bubbling at the edges.
- Step 10 — Rest before serving. Let the gratin stand for 10 to 15 minutes so the layers settle — it slices far more cleanly and tastes even better.
Tips for Success
- A mandoline is your best friend here; even slices mean even cooking and that signature silky texture.
- Do not rinse the sliced potatoes — the surface starch is what helps the sauce thicken as it bakes.
- Taste the cream sauce before layering; Boursin is already salty, so season with a light hand.
- If the top browns too quickly, tent it loosely with foil for the last stretch of baking.
- Leftovers reheat wonderfully in a moderate oven with a splash of extra cream.
Serving Ideas
- Alongside roast chicken or lamb, where it will happily steal the spotlight.
- With a crisp green salad and good bread for a simple vegetarian supper.
- Next to pan-fried salmon — the creamy potatoes love a rich fish.
- As part of a festive spread; it reheats like a dream for Boxing Day.
FAQs
Can I assemble this the day before?
Yes. Layer everything, cover tightly and refrigerate overnight, then bake straight from the fridge with an extra 10 minutes added.
Which Boursin flavour works best?
The classic garlic and fine herbs is perfect, but the shallot and chive version is lovely too. Avoid the lighter versions — they do not melt as luxuriously.
Can I make it without cream?
You can use all milk for a lighter gratin, though it will be less rich. A half-and-half mix of single cream and milk is a happy middle ground.
Why are my potatoes still crunchy?
The slices were probably cut too thick or the oven runs cool. Slice to 2 to 3mm and check the centre with a knife before the final browning.
Does it freeze well?
It does, for up to two months. Thaw overnight in the fridge and reheat covered in the oven until piping hot.
The next time you need a side dish that behaves like a main event, you know exactly where to look.
