Yukon Gold and Sweet Potato Gratin

Yukon Gold and Sweet Potato Gratin photo
total time:
1 hr
MeganMegan

ingredients

  • 6 tablespoons (3/4 stick) butter, room temperature, divided
  • 2 1/4 pounds Yukon Gold potatoes, rinsed
  • 1 1/2 pounds red-skinned sweet potatoes (yams), peeled
  • 2 cups whole milk
  • 1 garlic clove, pressed
  • 1 tablespoon kosher salt
  • 2 teaspoons fresh thyme leaves
  • 1 teaspoon ground black pepper
  • 1/8 teaspoon ground nutmeg
  • 1 cup whipping cream

directions

  • 1

    Preheat oven to 400°F. Coat 13x9x2-inch glass baking dish with 2 tablespoons butter. Thinly slice all potatoes; place in prepared dish. Bring milk and next 5 ingredients to boil in medium saucepan; pour over potatoes. Dot with 2 tablespoons butter. Cover with foil. Bake until potatoes are tender and milk is almost absorbed, about 50 minutes.

  • 2

    Bring cream to boil in saucepan. Uncover potatoes, pour cream over, and dot with 2 tablespoons butter. Bake uncovered until top is golden brown in spots, about 25 minutes. Cool slightly.

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