Hands-on Time
30 Mins
Total Time
1 Hour 35 Mins
Makes 8 servings

You'll know when the potatoes are perfectly cooked when a table knife slides easily through the center.

How to Make It

Preheat oven to 400°. Cut sweet potatoes and russet potatoes into 1/8-inch-thick slices, using a mandoline or sharp knife. Toss together potatoes, 3/4 cup heavy cream, and salt in a large bowl. Transfer to a lightly greased 2-qt. gratin dish, and spread potatoes into layers. Top with 1 cup Gruyère cheese. Pour 3/4 cup more heavy cream over potatoes, and sprinkle with remaining 1/2 cup Gruyère. Cover loosely with aluminum foil. Bake at 400° for 40 minutes. Uncover and bake 20 to 25 minutes or until potatoes are tender and cheese is golden brown. Transfer to a wire rack; cool 5 minutes.

Ratings & Reviews

Super easy and super delicious

November 16, 2015
This has become a side dish staple on my Thanksgiving table. Buget one hour rather than 40 minutes In the oven.

cmlvngstn's Review

December 19, 2013
Outstanding! This will definitely become a staple dish for our family.