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Overhead shot of sweet potato gratin after baking with rosemary pecan crunch on top

Sweet Potato Gratin with Maple Rosemary Pecan Crunch

This Sweet Potato Gratin with Maple Rosemary Pecan Crunch is a decadent, comforting side dish - perfect for any type of holiday dinner! It's made with super simple ingredients - thinly sliced sweet potatoes, heavy cream, Gruyere cheese, parmesan, garlic, rosemary, and nutmeg! The rosemary pecan crunch tops it all off and adds incredible texture and sweet & savory flavor!

Course Side, Side Dish
Cuisine Holiday
Keyword garlic gruyere sweet potato gratin, holiday side dish, layered potato gratin, pecan cookies, potato gratin, potato gratin with gruyere, recipe for sweet potatoes gratin, rosemary, rosemary sweet potato gratin, sweet potato gratin, sweet potato side dish
Prep Time 20 minutes
Cook Time 1 hour 5 minutes
Servings 6 -8
Author Molly | Spices in My DNA


For the sweet potato gratin

  • 1 3/4 cups heavy cream
  • 3 cloves garlic, crushed and peeled
  • 3 sprigs fresh rosemary
  • 1 teaspoon salt
  • 1/2 teaspoon pepper
  • 1/4 teaspoon nutmeg
  • 1 tablespoon unsalted butter, softened
  • 1 3/4 pounds sweet potatoes, very thinly sliced to 1/8'' thick rounds (about 2 medium-large sweet potatoes)*
  • 6 ounces freshly grated Gruyere cheese
  • 1/4 cup finely grated parmesan cheese

For the maple rosemary pecan crunch

  • 3/4 cup chopped pecans
  • 1 1/2 tablespoons light brown sugar
  • 3 teaspoons pure maple syrup
  • 1 teaspoon olive oil
  • pinch of salt
  • pinch of cinnamon
  • 1 teaspoon finely chopped fresh rosemary


  1. Preheat oven to 325℉. Begin by infusing the cream for the potatoes. Add heavy cream, garlic, 1 sprig rosemary, salt, pepper, and nutmeg to a medium saucepan. Bring to a simmer over medium to medium-high heat. Once simmering, reduce heat to medium-low and let steep for 10 minutes. Remove from heat.

  2. Grease a heavy bottomed oven safe skillet (preferably cast iron) with the softened butter. Arrange 1/3 of the potatoes in an even layer on the bottom of the skillet, followed by 1/3 of the Gruyere cheese. Repeat with remaining potatoes and Gruyere, with the final layer of Gruyere on the top. Pour the cream over the top (I like to leave the garlic cloves and rosemary in there for extra flavor!). Sprinkle with the parmesan cheese. Lay the remaining 2 sprigs of rosemary on top. Cover tightly with aluminum foil and bake for 1 hour, or until potatoes are tender.

  3. Meanwhile, make the rosemary pecan crunch. Heat a medium nonstick skillet over medium-high heat. Add the pecans, brown sugar, maple syrup, olive oil, salt, and cinnamon and cook for 3-4 minutes, stirring frequently, or until sugar has melted and caramelized, and pecans are golden brown and fragrant. To finish, stir in the rosemary and an extra pinch of salt. Let cool.

  4. Once gratin has baked for an hour, remove the foil and preheat your broiler to high. Carefully position the rack in the upper third of the oven. Broil gratin for a few minutes, until the top is golden brown and bubbly. Let cool for a few minutes, then sprinkle the top with maple rosemary pecan crunch. Serve hot!

Recipe Notes

*I usually slice my sweet potatoes by hand with a sharp knife, but if you have a mandolin, that works great too + will be quicker! I have one similar to this one and it works great!