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Scalloped Yukon Gold and Sweet Potato Gratin with Fresh Herbs

This elegant vegetarian side dish brings together the buttery texture of Yukon Gold potatoes and the earthy sweetness of red-skinned sweet potatoes. Infused with a fragrant blend of fresh rosemary, sage and thyme, the vegetables are bathed in a garlic-enriched double cream before being topped with plenty of nutty Gruyère cheese. It is a sophisticated update on the classic dauphinoise, offering a beautiful contrast of colours and flavours that feels truly indulgent.

Perfect for a Sunday roast or a festive gathering, this potato gratin can be prepared up to six hours in advance, making it an excellent choice for stress-free hosting. The long, slow bake ensures the potatoes are perfectly tender, while the final blast without the foil creates a delicious golden crust. Serve it alongside roasted roots or a celebratory nut roast for a complete vegetarian feast.

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Ingredients for Scalloped Yukon Gold and Sweet Potato Gratin with Fresh Herbs

  • 675g medium Yukon Gold potatoes

  • 675g medium red-skinned sweet potatoes (yams)

  • 475ml double cream

  • 60ml (1/2 stick) butter

  • 2 garlic cloves, minced

  • 1 tablespoon minced fresh Italian parsley

  • 1 tablespoon minced fresh rosemary

  • 1 tablespoon minced fresh sage

  • 1 tablespoon minced fresh thyme

  • 1 1/2 teaspoons fine sea salt

  • 3/4 teaspoons freshly ground black pepper

  • 140g (packed) coarsely grated Gruyére cheese (about 140g )

How to make Scalloped Yukon Gold and Sweet Potato Gratin with Fresh Herbs

Fill large bowl with cold water. Working with 1 Yukon Gold potato at a time, peel, then cut into 1/8-inch-thick rounds and place in bowl with water. Repeat with sweet potatoes. Combine cream, butter, and garlic in medium saucepan; bring to simmer. Remove from heat. Mix all herbs in small bowl. Mix sea salt and black pepper in another small bowl.

Butter 13x9x2-inch glass baking dish. Drain potatoes, then pat dry with kitchen towels. Transfer half of potatoes to prepared baking dish. Use hands to distribute and spread evenly. Sprinkle with half of salt-pepper mixture, then half of herb mixture. Sprinkle with half of cheese. Repeat with remaining potatoes, salt-pepper mixture, herb mixture, and cheese. Pour cream mixture over gratin, pressing lightly to submerge potato mixture as much as possible. DO AHEAD: Can be made 6 hours ahead. Cover with plastic wrap and chill. Remove plastic wrap before baking.

Preheat oven to 204°C. Cover gratin tightly with foil. Bake 30 minutes. Uncover; bake until top of gratin is golden and most of liquid is absorbed, about 25 minutes longer. Let stand 10 minutes; serve.

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.

  • 16 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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