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overhead view of yukon gold sweet potatoes with serving utensils.
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4 from 3 votes

Yukon Gold Sweet Potato Au Gratin

Yukon Gold Sweet Potato Au Gratin ~ delicious blend of 2 kinds of potatoes baked in a cheesy, au gratin sauce. 
Prep Time10 mins
Cook Time1 hr
Total Time1 hr 10 mins
Course: Side Dish
Cuisine: American
Keyword: au gratin potatoes
Servings: 4


  • 1 pound yukon gold potatoes
  • 1 pound sweet potatoes
  • 1 tablespoon butter
  • 2 cups heavy cream
  • Pinch of nutmeg
  • 1 ½ teaspoons fresh thyme finely chopped
  • 1 ¼ teaspoons salt
  • ½ teaspoon pepper
  • 2 cups gruyere cheese grated
  • Aluminum foil
  • Cooking spray


  • Preheat the oven to 375, then in a medium saucepan, add the heavy cream, nutmeg, thyme, salt and pepper. Simmer over low heat 5 minutes, stirring occasionally.
  • Peel the sweet potatoes, leave the skins on the Yukon gold, then thinly slice both, trying to get them about the same thickness.
  • Use the tablespoon of butter and generously butter your baking dish then add the first layer of potatoes, overlapping them.
  • Top with about ⅓ of the Gruyere cheese, another layer of potatoes, topped with another ⅓ of the cheese then pour all of the cream mixture over the top of the potatoes. Top with the remaining cheese then using a spatula gently press down on the potatoes.
  • Measure a sheet of aluminum foil slightly larger than your baking dish the spray the center of the underside with cooking spray. This prevents the cheese from sticking to the foil during the baking process.
  • Cover the potatoes and bake for 30 minutes. Uncover and continue baking another 20-25 minutes or until the potatoes are tender and golden brown on top.