There’s something timeless about a bubbling dish of potato and leek gratin fresh from the oven. With tender slices of potato layered between buttery leeks, rich cream, and a crisp Parmesan breadcrumb topping, this classic comfort food feels both rustic and elegant at the same time. Whether you’re serving it alongside an Easter ham, holiday roast or bringing it to a cozy family dinner, this potato and leek gratin is the kind of recipe that never goes out of style.
If you’re looking for a make-ahead side dish that feels special but uses simple pantry ingredients, this one delivers every single time.
Why You’ll Love This Potato and Leek Gratin
- Ultra-creamy interior with perfectly tender potatoes
- Sweet, mellow leeks add depth without overpowering
- Golden, crunchy Parmesan breadcrumb topping
- Ideal for holidays, Sunday dinners, and entertaining
- Can be prepped ahead and baked before serving
This is the kind of recipe that gets requested year after year.
Ingredients You’ll Need
- Butter (divided)
- Large leeks, sliced
- Minced garlic
- Baking potatoes (russet or similar), peeled and thinly sliced
- Heavy whipping cream
- Milk
- Eggs
- Salt
- White pepper
- Day-old white bread (French or Italian works best)
- Grated Parmesan cheese
Tip: Use a mandoline or sharp knife to keep potato slices evenly thin so they cook perfectly.
How to Make Potato and Leek Gratin
1. Prep the Baking Dish
Preheat your oven to 375°F and generously butter a shallow baking dish. This helps prevent sticking and adds flavor from the very first layer.
2. Soften the Leeks
Melt butter in a large skillet over medium heat. Add the sliced leeks and garlic, cooking until soft and fragrant. This step mellows the leeks and builds a rich, savory base.
3. Layer the Gratin
Arrange half of the sliced potatoes in the baking dish, followed by half of the leek mixture. Repeat with remaining potatoes and leeks.
Whisk together the cream, milk, eggs, salt, and white pepper, then pour evenly over the layers.
4. Make the Parmesan Crumb Topping
Process day-old bread into fine crumbs, then mix with grated Parmesan and melted butter. Sprinkle evenly over the top for that irresistible golden crust.
5. Bake Until Golden
Bake for about 1 hour and 15 minutes, until the top is deeply golden and the potatoes are fork-tender. Let rest briefly before serving so the layers set.
Make-Ahead & Storage Tips
- Make ahead: Assemble the gratin up to 24 hours in advance, cover, and refrigerate. Bake just before serving.
- Leftovers: Store covered in the refrigerator for up to 3 days.
- Reheating: Warm in the oven for best texture—this keeps the top crispy.
What to Serve with Potato and Leek Gratin
This dish pairs beautifully with:
It’s hearty enough to stand on its own, but elegant enough to elevate any main dish.
Potato and Leek Gratin
- Total Time: 1 hour 40 minutes
- Yield: 6–8 SERVINGS 1x
Description
This creamy potato and leek gratin is a simple holiday side dish made with tender sliced potatoes, buttery leeks, rich cream, and a golden Parmesan breadcrumb topping. Classic, comforting, and perfect for entertaining.
Ingredients
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5 tablespoons butter, divided
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2 large leeks, sliced and well washed
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2 tablespoons minced garlic
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2 pounds baking potatoes, peeled and thinly sliced
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1 cup heavy whipping cream
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1 cup milk
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3 large eggs
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2 teaspoons salt
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¼ teaspoon white pepper
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2–3 slices dense day-old white bread (French or Italian)
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½ cup grated Parmesan cheese
Instructions
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Preheat oven to 375°F. Generously grease a shallow 2½-quart baking dish with 1 tablespoon butter.
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Melt 2 tablespoons butter in a large skillet over medium heat. Add leeks and garlic; cook, stirring often, for 8–10 minutes until softened. Remove from heat.
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Slice potatoes crosswise into ⅛-inch-thick slices. Layer half of the potatoes in the prepared baking dish, then top with half of the leek mixture. Repeat layers.
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In a medium bowl, whisk together cream, milk, eggs, salt, and white pepper until well combined. Pour evenly over the potato and leek layers.
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Tear bread into pieces and process into fine crumbs. Measure ¾ cup crumbs and place in a bowl. Stir in Parmesan cheese. Melt remaining 2 tablespoons butter and mix into the crumbs.
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Sprinkle the breadcrumb mixture evenly over the gratin.
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Bake for 1 hour 15 minutes, or until the top is golden brown and potatoes are tender.
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Let stand 5–10 minutes before serving.
Notes
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Use a mandoline for evenly sliced potatoes.
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Yukon Gold potatoes can be substituted for a creamier texture.
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Cover loosely with foil if the top browns too quickly.
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This dish can be assembled up to 24 hours ahead and baked before serving.
- Prep Time: 25 MINS
- Cook Time: 1 HOUR 15 MINS
- Category: Side Dish
- Method: BAKED
- Cuisine: AMERICAN | FRENCH INSPIRED
Frequently Asked Questions
Can I use Yukon Gold potatoes instead of baking potatoes?
Yes! Yukon Golds create an even creamier texture, though russets give a slightly fluffier interior.
Can I skip the breadcrumb topping?
You can, but the Parmesan crumbs add contrast and texture that make this gratin truly special.
Do leeks need to be washed thoroughly?
Absolutely. Slice first, then rinse well—leeks often trap dirt between layers.
Few dishes feel as comforting and satisfying as a classic potato and leek gratin. With its creamy layers, buttery leeks, and crisp Parmesan topping, this recipe brings warmth to the table in the best possible way. Whether you’re cooking for a holiday gathering or a quiet family dinner, this is one of those timeless recipes you’ll come back to again and again.
Save it, share it, and don’t be surprised when it becomes a permanent part of your seasonal rotation.
