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Vegan Au Gratin Potatoes

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This easy vegan potato gratin is a creamy, comforting side dish made without nuts or dairy. Cooked entirely in one skillet, it’s a flavorful and fuss-free recipe perfect for festive occasions like Thanksgiving or Christmas, or a cozy meal any day.

Ingredients

35 ml (2½ tbsp) olive oil, divided

30 g (2 tbsp) vegan butter

2 shallots, finely diced

3 garlic cloves, finely diced

1 sprig fresh rosemary, leaves finely chopped

4 sprigs fresh thyme, leaves only

750 g (1.6 lb) starchy potatoes, thinly sliced

1½ tbsp (18 g) potato starch

360 ml (1½ cups) soy, almond, or other plant milk

2 tsp white miso paste

2 tbsp nutritional yeast

Heaped ¼ tsp ground nutmeg

Generous black pepper, to taste

¾ tsp coarse salt (Maldon or similar), to taste

Instructions

  1. Preheat oven to 200°C / 390°F (180°C / 355°F fan).
  2. Heat 1 tbsp olive oil and 1 tbsp vegan butter in a large ovenproof skillet over low heat. Sauté shallots until softened, then add garlic, rosemary, and thyme. Cook gently until garlic softens. Remove and set aside.
  3. Wash and thinly slice the potatoes using a mandolin (3 mm / 1/8″ thick). Peel if desired.
  4. In the same skillet, melt remaining vegan butter and 1 tbsp oil. Whisk in potato starch and let it bubble for 60 seconds.
  5. Gradually whisk in plant milk, reserving a splash to dissolve the miso. Bring to a simmer to thicken.
  6. Stir in dissolved miso, nutritional yeast, nutmeg, pepper, and salt. Return the sautéed shallot mixture and adjust seasoning.
  7. Arrange the potato slices in overlapping circles over the sauce, leaving about a third exposed. Brush with remaining olive oil, season with pepper and thyme.
  8. Cover with foil and bake for 20 minutes. Remove foil, bake for another 10 minutes, then increase heat to 220°C / 428°F and bake 10-15 minutes more until golden and bubbling.

Notes

  • Use vegan cream instead of plant milk for a richer version and skip the starch.
  • Plain flour can replace potato starch if gluten is not a concern.
  • Use a 26 cm / 10-inch oven-safe skillet or transfer to a snug baking dish if needed.
  • Dilute miso in plant milk for even distribution.
  • Leftovers can be reheated, though best freshly baked.