Two-Potato Gratin

5 ingredients
4 steps

Ingredients

  • 3 large sweet potatoes, peeled and thinly sliced
  • 4 medium potatoes, peeled and thinly sliced
  • 1/2 medium onion, thinly sliced
  • 1 1/2 cups vegetable broth, or more as needed
  • 2 cups shredded Gruyere cheese

Directions

  1. 1
    Preheat the oven to 350 degrees F (175 degrees C).
  2. 2
    Place potatoes and sweet potatoes in a large baking dish. Mix in onion. Add 1 to 1 1/4 cups vegetable both.
  3. 3
    Bake in the preheated oven until potatoes start to soften, about 20 minutes. Remove from oven and add Gruyere cheese. Pour in more vegetable broth if casserole looks dry.
  4. 4
    Return to the oven and continue baking until potatoes are tender, about 30 minutes. Stir and serve hot.

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