Leek recipes side dishes often get overlooked, but this Creamy Leek and Potato Gratin is about to change that. It's the ultimate comfort food: layers of tender potatoes and sweet, caramelized leeks baked in a luscious cream sauce with a golden, bubbly cheese crust.
Advertisements1
I love this dish because it's simple enough for a Tuesday but elegant enough for Thanksgiving. The leeks add a subtle oniony sweetness that pairs perfectly with the creamy potatoes. Plus, it's make-ahead friendly, so you can prep it in advance and bake when ready.
If you're looking for a leek recipe that's hearty, satisfying, and sure to impress, this is it. Let's get cooking!
Why You'll Love This Recipe
About the Ingredients
2 tablespoons (28g) unsalted butter
For sautéing the leeks. You can use olive oil for a dairy-free option.
3 large leeks, white and light green parts only, sliced into half-moons
About 4 cups. Clean thoroughly – leeks trap dirt. If leeks are unavailable, use 2 large shallots.
2 cloves garlic, minced
Fresh garlic adds a punch of flavor. Use 1/2 teaspoon garlic powder if needed.
2 pounds (900g) Yukon Gold potatoes, peeled and thinly sliced (about 1/8-inch thick)
Yukon Golds hold their shape and are creamy. Russets work too but are starchier. A mandoline ensures even slices.
1 1/2 cups (360ml) heavy cream
For richness. Substitute with half-and-half for a lighter version, but the sauce will be thinner.
1/2 cup (120ml) chicken or vegetable broth
Adds savory depth. Use vegetable broth for a vegetarian option.
1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried)
Thyme complements leeks beautifully. Rosemary is a good substitute.
1 teaspoon salt
Adjust to taste. Sea salt or kosher salt recommended.
1/2 teaspoon black pepper
Freshly ground is best.
1 1/2 cups (170g) shredded Gruyère cheese
Nutty and melts beautifully. Swiss or sharp cheddar are great substitutes.
1/2 cup (50g) grated Parmesan cheese
Adds a salty, savory kick. Pecorino Romano works well too.
Tips & Tricks
- Slice potatoes uniformly (1/8-inch) so they cook evenly. A mandoline is your best friend here.
- Don't skip cleaning the leeks! Soak them in cold water and swish to remove grit.
- Let the gratin rest for 10 minutes after baking – it sets the layers and makes serving easier.
Pro Tips
Step-by-Step Instructions
1. Preheat and Prep
Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with butter or cooking spray.
2. Sauté the Leeks
Melt butter in a large skillet over medium heat. Add leeks and cook, stirring, until softened and lightly golden, about 5-7 minutes. Add garlic and cook for 1 minute until fragrant. Remove from heat.
3. Mix the Cream Sauce
In a large bowl, whisk together heavy cream, broth, thyme, salt, and pepper.
4. Layer the Gratin
Spread a thin layer of cream sauce on the bottom of the dish. Layer half of the potato slices, overlapping slightly. Top with half of the leek mixture and sprinkle with half of the Gruyère. Repeat with remaining potatoes, leeks, and Gruyère. Pour remaining cream sauce over the top.
5. Top with Parmesan
Sprinkle Parmesan cheese evenly over the surface.
6. Bake Covered
Cover the dish with foil and bake for 30 minutes. The potatoes should be nearly tender when pierced with a fork.
7. Bake Uncovered
Remove foil and bake for an additional 20-25 minutes, until the top is golden brown and the edges are bubbling. The potatoes should be fully tender and the sauce thickened.
8. Rest and Serve
Let the gratin rest for 10 minutes before serving. This allows the layers to set.
Delicious Variations
- Add cooked bacon or ham for a meaty version.
- Swap Gruyère for blue cheese for a tangy twist.
- Mix in sliced mushrooms with the leeks for extra earthiness.
How to Store Creamy Leek and Potato Gratin
Refrigerator
Store leftovers in an airtight container in the fridge for up to 4 days.
Freezer
Freeze the unbaked gratin for up to 3 months. Thaw overnight and bake as directed, adding 15 minutes to the covered baking time.
Reheating
Reheat individual portions in the microwave or oven at 350°F (175°C) until warmed through.
Frequently Asked Questions
Q: Can I make this gratin ahead of time?
Yes, you can assemble the gratin up to 24 hours in advance and refrigerate it. When ready to bake, add about 15-20 minutes to the covered baking time.
Q: Can I use other potatoes?
Yes, russets or red potatoes work, but Yukon Golds are ideal because they hold their shape and have a buttery flavor.
Q: How do I clean leeks properly?
Slice the leeks, then place them in a bowl of cold water and swish them around. Let them sit for a few minutes, then lift them out with a slotted spoon. Repeat if needed to remove all grit.
Q: Can I make this dairy-free?
You can substitute the butter with olive oil, use a dairy-free cream alternative, and use vegan cheese. The texture may vary slightly, but it will still be delicious.
This Creamy Leek and Potato Gratin is a must-try for any leek lover. It's easy, delicious, and guaranteed to be a hit. Give it a try and let me know what you think in the comments below! Work smarter, not harder.
Creamy Leek and Potato Gratin
Creamy Leek and Potato Gratin: a rich, cheesy side dish that's perfect for holidays or weeknight dinners.
🧂 Ingredients
- 2 tablespoons (28g) unsalted butter
- 3 large leeks, white and light green parts only, sliced into half-moons
- 2 cloves garlic, minced
- 2 pounds (900g) Yukon Gold potatoes, peeled and thinly sliced (about 1/8-inch thick)
- 1 1/2 cups (360ml) heavy cream
- 1/2 cup (120ml) chicken or vegetable broth
- 1 teaspoon fresh thyme leaves (or 1/2 teaspoon dried)
- 1 teaspoon salt
- 1/2 teaspoon black pepper
- 1 1/2 cups (170g) shredded Gruyère cheese
- 1/2 cup (50g) grated Parmesan cheese
📋 Instructions
- 1Preheat and Prep — Preheat your oven to 375°F (190°C). Grease a 9×13-inch baking dish with butter or cooking spray.
- 2Sauté the Leeks — Melt butter in a large skillet over medium heat. Add leeks and cook, stirring, until softened and lightly golden, about 5-7 minutes. Add garlic and cook for 1 minute until fragrant. Remove from heat.
- 3Mix the Cream Sauce — In a large bowl, whisk together heavy cream, broth, thyme, salt, and pepper.
- 4Layer the Gratin — Spread a thin layer of cream sauce on the bottom of the dish. Layer half of the potato slices, overlapping slightly. Top with half of the leek mixture and sprinkle with half of the Gruyère. Repeat with remaining potatoes, leeks, and Gruyère. Pour remaining cream sauce over the top.
- 5Top with Parmesan — Sprinkle Parmesan cheese evenly over the surface.
- 6Bake Covered — Cover the dish with foil and bake for 30 minutes. The potatoes should be nearly tender when pierced with a fork.
- 7Bake Uncovered — Remove foil and bake for an additional 20-25 minutes, until the top is golden brown and the edges are bubbling. The potatoes should be fully tender and the sauce thickened.
- 8Rest and Serve — Let the gratin rest for 10 minutes before serving. This allows the layers to set.
Ethan writes about tech productivity and digital tools, focusing on how to streamline workflows without overcomplicating. He tests apps and gadgets in his daily life and shares what actually works.
