Vegan Potato Dauphinoise Gratin (GF)

Vegan Potato Dauphinoise Gratin (GF)

This Vegan Potato Dauphinoise Gratin is the perfect rich and indulgent yet surprisingly healthy side dish.

Vegan Potato Dauphinoise Gratin (GF)

What I love about this Vegan Potato Dauphinoise Gratin (you may call it potato casserole or scalloped potatoes in your part of the world!) is that it really gives you the best of both potato-side-dish worlds. A golden brown, crispy top hides layers of velvety potatoes enveloped in a luxuriously creamy sauce. 

It’s easy to make too – just make your sauce, slice your potatoes, arrange them in a baking dish, pour over the sauce and pop in the oven! 

Vegan Potato Dauphinoise Gratin (GF)

I decided to use new potatoes in this recipe, as their slightly harder, waxy texture ensures they don’t turn into an unappetising mush whilst baking under all that creamy sauce. 

The sauce comes together really quickly and couldn’t be easier to make – just fry off some onions or leeks in a little oil, then add unsweetened almond milk (or oat milk for a nut-free version), nutritional yeast (for a cheesy flavour), and some seasonings to taste.

Then just use some cornflour to thicken the sauce. It’s important that you dissolve the cornflour in a little splash of water first before adding to the sauce, because otherwise it will clump up in the almond milk instead of being distributed evenly. 

What’s so refreshingly quick and easy about this recipe compared to lots of other potato-based dishes, is that you don’t have to boil or even peel the potatoes first.

Just thinly slice them and pour over enough sauce to cover – this means they’ll be able to cook in the sauce in the oven, whilst the top will simultaneously crisp up. 

Vegan Potato Dauphinoise Gratin (GF)

This gratin is one of my favourite sides, and it goes really with other side dishes such as my: 

If you try out this recipe or anything else from my blog, I’d really love to hear any feedback! Please give it a rating, leave a comment, or tag a photo #rhiansrecipes on Instagram! Thank you.

Check out this short video here to see me making this Vegan Potato Dauphinoise Gratin:  


Vegan Potato Dauphinoise Gratin (GF)
Vegan Potato Dauphinoise Gratin (GF)
Prep Time
15 mins
Cook Time
1 hrs
Total Time
1 hrs 15 mins
Vegan Potato Dauphinoise Gratin - golden brown and crispy on the top, with thin layers of velvety potatoes enveloped in a luxuriously creamy sauce.
Course: Main Course, Side Dish
Servings: 4
Calories: 208 kcal
  • 500 g (17oz) new potatoes or any waxy potatoes
  • 2 tablespoons olive oil (or sub vegetable or rapeseed oil)
  • 1 onion, finely sliced
  • 500 ml (2 1/4 cups) unsweetened almond milk (or sub oat milk for nut-free)
  • 2 tablespoons nutritional yeast
  • 1 teaspoon (Dijon) mustard
  • 1 vegetable stock cube (ensure gluten-free if necessary)
  • Salt + pepper, to taste
  • 1 heaped tablespoon cornflour
  1. Preheat oven to 180 degrees (350 degrees)
  2. Slice potatoes either using a mandoline, the slicer setting on a food processor, or very thinly slice them by hand (no need to peel them)

  3. Place the sliced potatoes in a large baking dish
  4. Heat up oil in saucepan and add onions once hot
  5. Fry on a low heat for around 10 minutes, until soft and slightly caramelised
  6. Add almond milk, nutritional yeast, mustard, stock cube, salt + pepper and bring to a boil then turn to a low heat
  7. Dissolve the cornflour in a splash of water in a small bowl, and add to the saucepan
  8. Keep stirring until cornflour has distributed evenly and the sauce has thickened up
  9. Pour the sauce over the sliced potatoes
  10. Cover the dish with tin foil or baking paper and bake for around 30 minutes
  11. Take off foil or baking paper and bake for a further 15 minutes, until top is crispy and golden brown
  12. Best enjoyed immediately!

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