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Yukon Gold and Sweet Potato Gratin

Peer reviewed by UK recipe editorsAuthored by UK recipe editorsOriginally published 17 Jan 2026

Meets Patient’s editorial guidelines

This Yukon Gold and sweet potato gratin is a beautifully balanced vegetarian side dish that offers a sophisticated twist on the classic dauphinois. By combining earthy, buttery Yukon Gold potatoes with naturally sweet red-skinned sweet potatoes, you create a vibrant contrast in both colour and flavour. Infused with fresh thyme, garlic, and a hint of warming nutmeg, the vegetables are simmered in milk before being finished with a rich cream topping for a truly indulgent texture.

Perfect for a Sunday roast or as a centrepiece for a festive dinner, this homemade gratin is remarkably simple to prepare. The dual-cooking method ensures the potatoes are perfectly tender inside while achieving a golden, bubbling crust on top. Serve it alongside roasted greens or a crisp salad for a comforting, seasonal meal that will please the whole family.

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Ingredients for Yukon Gold and Sweet Potato Gratin

  • 90ml (3/4 stick) butter, room temperature, divided

  • 1.0kg Yukon Gold potatoes, rinsed

  • 675g red-skinned sweet potatoes (yams), peeled

  • 475ml whole milk

  • 1 garlic clove, pressed

  • 1 tablespoon kosher salt

  • 2 teaspoons fresh thyme leaves

  • 1 teaspoon ground black pepper

  • 1/8 teaspoons ground nutmeg

  • 240ml whipping cream

How to make Yukon Gold and Sweet Potato Gratin

Preheat oven to 204°C. 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.

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.

Disclaimer

While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.

Article history

The information on this page is peer reviewed by qualified clinicians.

  • 17 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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