Creamy potato gratin with caramelised onions

The sweetness of the caramelised onions cuts through the rich creaminess of this dauphinoise-style bake

  • Prep:20 mins
    Cook:2 hrs 15 mins
  • Serves 8
  • Easy

Nutrition per serving

  • kcal 357
  • fat 23g
  • saturates 12g
  • carbs 31g
  • sugars 4g
  • fibre 3g
  • protein 9g
  • salt 0.29g


  • 2 tbsp olive oil
  • 2 onions, thinly sliced
  • 2 thyme sprigs, leaves picked, plus extra to serve
  • 150ml double cream
  • 175ml milk
  • 1¼kg/2lb 12oz large potatoes, peeled and thinly sliced
  • butter, for greasing
  • 100g crème fraîche
  • 85g parmesan, grated


  1. Up to 2 days before serving, heat oven to 200C/180C fan/gas 6. Heat the oil in a large frying pan. Add the onions and thyme, cover, and cook over a gentle heat for 10-15 mins until softened and caramelised. Pour the cream and milk into a large bowl and season well. Add the potatoes and mix to combine.

  2. Butter a 23 x 28cm ovenproof dish, then layer in half the potatoes. Spread the onion mixture on top, then layer on the remaining potatoes. Press down with your hands. Pour over the milk mixture, which should come just level with the potatoes. If not, add a little more milk until it does. Cover with foil, then bake for 11?2 hrs until tender. Remove from the oven and leave to cool. Cover and store in the fridge.

  3. On the day, heat the oven to 220C/200C fan/gas 7. Uncover the gratin, spread the crème fraîche on top, then sprinkle over the Parmesan. Put in the oven and cook for 30 mins until the cheese is melted, the top crisp and golden brown, and the gratin piping hot. Serve garnished with extra thyme.

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