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Cheesy Potato and Kale Gratin with Rye Croutons

This cheesy potato and kale gratin with rye croutons is the ultimate comforting vegetarian dish, offerring a sophisticated twist on a classic bake. The combination of earthy kale and nutty Gruyère provides a deep, savoury flavour, while the addition of golden, toasted rye bread croutons adds a delightful crunch. It is a wonderful centrepiece for a weekend lunch or a luxurious accompaniment to a Sunday roast.

Using yellow-fleshed potatoes ensures a creamy, buttery texture that holds its shape beneath the bubbling cheese and garlic-infused cream. This heart-healthy leafy green dish is as nutritious as it is indulgent, making it a brilliant way to enjoy seasonal kale. Prepare the components in advance for a stress-free meal that is sure to become a cold-weather favourite.

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Ingredients for Cheesy Potato and Kale Gratin with Rye Croutons

  • 4 slices seeded rye bread

  • 1 large bunch kale (preferably Tuscan

  • about 350g ), ribs removed, leaves torn into 3" pieces

  • 170g good-quality Gruyère, grated on the large holes of a food processor blade or box grater (about 300g )

  • 60g good-quality Parmesan, grated on the large holes of a food processor blade or box grater (about 120ml )

  • 900g yellow-fleshed potatoes (such as Yukon Gold), unpeeled, cut crosswise into 1/8"-thick slices (see Cooks\

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  • or 3-quart baking dish'

Arrange a rack in centre of oven; preheat to 350ºF. Arrange bread slices on a rimmed baking sheet and bake, flipping once halfway through, until dry and lightly toasted, 15–20 minutes. Let cool. Transfer to a resealable plastic bag and break into irregular, 1/2"–1" pieces. Transfer to a medium bowl; set aside.

Meanwhile, wash and spin-dry kale, then layer between paper towels or a large clean kitchen towel and pat dry.

Mix Gruyère and Parmesan in a medium bowl. Shingle one-quarter of potatoes in 3 or 4 rows, slightly overlapping, in bottom of baking dish. Sprinkle with one-quarter of thyme, 1/4 teaspoons salt, and 1/8 teaspoons pepper. Top with 2 cups kale and one-quarter of cheese mixture. Repeat 2 more times. Shingle remaining potatoes over cheese; top with 1/4 teaspoons salt, 1/8 teaspoons pepper, and remaining thyme. Reserve remaining kale and cheese.

Stir cream, garlic, 1/4 teaspoons salt, and 1/8 teaspoons pepper in a liquid measuring cup. Pour evenly over potatoes.

Bake gratin 40 minutes. Cover with foil and continue to bake until cream is bubbling and thick and potatoes are tender when pierced with a paring knife, 35–45 minutes more.

Meanwhile, toss reserved croutons with 2 tablespoons oil in a medium bowl. Toss remaining kale with remaining 1 tablespoon oil. Top gratin with kale, remaining cheese, then croutons, allowing kale pieces to peek through. Bake gratin until croutons are golden brown and exposed kale edges are well-crisped, about 15 minutes more. Let cool at least 10 minutes before serving.

Bread can be toasted 3 days ahead. Store in an airtight container at room temperature. Kale can be torn, washed, and patted dry 3 days ahead. Wrap in paper towels, place in a resealable plastic bag, and chill.

Gratin can be made 1 day ahead. Let cool, then wrap tightly in plastic and chill. Bring to room temperature, cover with foil, and warm in a 300ºF oven until heated through, 15–20 minutes. Uncover and continue to warm to re-crisp croutons and exposed kale edges, about 5 minutes.

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.

  • 28 Jan 2026 | Originally published

    Authored by:

    UK recipe editors

    Peer reviewed by

    UK recipe editors
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