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Vegan Sweet Potatoes Au Gratin

These Vegan Sweet Potatoes Au Gratin are the perfect side dish for any meal. The sweet potatoes are tender and creamy with a cheesy and slightly tangy flavor from the vegan cashew sauce.

Tasty Team
85% would make again
Vegan Sweet Potatoes Au Gratin


for 8 servings

Sweet Potatoes

  • 3 sweet potatoes, scrubbed
  • 3 tablespoons olive oil
  • 3 cloves garlic, minced
  • 3 sprigs fresh thyme
  • 1 ½ teaspoons pepper
  • 1 ½ teaspoons salt

Cashew Sauce

  • 1 ½ cups raw cashews (195 g)
  • 1 ¾ cups low sodium vegetable broth (420 mL), plus more for soaking cashews
  • 3 cloves garlic
  • ½ cup unsweetened coconut milk (120 mL)
  • ⅓ cup nutritional yeast (50 g)
  • 1 tablespoon lemon juice
  • ½ teaspoon ground nutmeg
  • ½ teaspoon cayenne
  • 1 teaspoon kosher salt
  • oil, for greasing

Nutrition Info

  • Calories 186
  • Fat 9g
  • Carbs 21g
  • Fiber 2g
  • Sugar 7g
  • Protein 4g

Estimated values based on one serving size.


  1. Add the cashews to a medium bowl with enough vegetable broth to cover. Soak for at least 2 hours, or overnight. Drain and rinse.
  2. Preheat the oven to 400˚F (200˚C).
  3. Using a mandolin or a sharp knife, thinly slice the sweet potatoes into rounds.
  4. Add the sweet potatoes to a large bowl and toss with the olive oil, garlic, thyme leaves, pepper, and salt.
  5. Add the drained cashews to a blender or food processor, along with the garlic, coconut milk, nutritional yeast, lemon juice, vegetable broth, nutmeg, cayenne, and salt. Blend until smooth and creamy.
  6. Grease a large cast-iron skillet or other ovenproof dish with oil.
  7. Pour ⅓ of the cashew sauce into the skillet and tilt to evenly coat the bottom. Layer half of the sweet potato rounds over the sauce, overlapping slightly to completely cover the bottom of the pan. Repeat with another ⅓ of the sauce, the rest of the potatoes, and the rest of the sauce.
  8. Bake for 1 hour, or until golden brown on top and the sweet potatoes are tender.
  9. Let cool for 15 minutes before slicing and serving.
  10. Enjoy!
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Vegan Sweet Potatoes Au Gratin