Potato and leek gratin

Potato and leek gratin is a comforting baked dish that layers tender potatoes with sautéed leeks, crispy prosciutto, and a creamy cheese mixture, making it perfect for cozy dinners. The result is a rich and flavorful side that pairs beautifully with various main courses.

19 Dec 2025
Cook time 70 min
Prep time 30 min

Ingredients:

3 slices prosciutto
2 leeks
2 potatoes
1/2 cup cheddar cheese
1/4 cup milk (1% fat)
1/3 cup light sour cream
2 garlic cloves
Potato and leek gratin

Potato and leek gratin is a rich and comforting dish that's perfect for cozy dinners or special occasions. This recipe combines the savory flavors of prosciutto, leeks, and potatoes with creamy cheese and a hint of garlic, resulting in a delightful, golden-baked gratin. Whether you're a seasoned chef or a beginner in the kitchen, this recipe is straightforward and will surely impress your family and friends.

Instructions:

1. Preheat the Oven:
Preheat your oven to 375°F (190°C).
2. Prepare Ingredients:
- Prosciutto: Roughly chop the prosciutto into small pieces.
- Leeks: Trim the roots and dark green parts of the leeks, leaving the white and light green parts. Slice them lengthwise and rinse thoroughly to remove any dirt. Slice the leeks into thin half-moons.
- Potatoes: Peel the potatoes (optional) and slice them thinly, about 1/8 inch thick. You can use a mandoline slicer for uniform slices.
3. Cook the Leeks and Prosciutto:
- In a large skillet over medium heat, cook the chopped prosciutto until it becomes crispy, about 4-5 minutes. Remove and set aside.
- In the same skillet, add the sliced leeks and minced garlic. Cook until the leeks become soft and slightly caramelized, about 7-10 minutes. Remove from heat.
4. Assemble the Gratin:
- Lightly grease a baking dish with butter or non-stick spray.
- Arrange half of the potato slices in an even layer at the bottom of the dish. Season lightly with salt and pepper.
- Spread half of the cooked leek and garlic mixture over the potatoes.
- Sprinkle a portion of the prosciutto over the leeks.
- Repeat the layers with the remaining potato slices, leeks, and prosciutto.
5. Prepare the Creamy Mixture:
- In a small bowl, whisk together the cheddar cheese, milk, and light sour cream until well combined.
6. Add Creamy Mixture:
- Pour the creamy mixture evenly over the layered ingredients in the baking dish.
7. Bake:
- Cover the baking dish with aluminum foil and bake in the preheated oven for 30 minutes.
- After 30 minutes, remove the foil and bake for an additional 15-20 minutes, or until the top is golden brown and the potatoes are tender when pierced with a fork.
8. Serve:
- Remove from the oven and let the gratin rest for a few minutes before serving. This allows the flavors to meld and makes it easier to slice.

With its creamy texture and layers of flavor, potato and leek gratin is a dish that will leave everyone asking for seconds. The crispy prosciutto adds a delightful contrast to the soft potatoes and leeks, making this gratin a standout on any dinner table. Remember to serve it hot and enjoy the comforting, delicious experience that this dish offers.

Potato and leek gratin FAQ:

What is the baking time for the potato and leek gratin?

Bake the gratin covered with aluminum foil for 30 minutes at 375°F (190°C), then uncover and bake for an additional 15-20 minutes until golden brown and the potatoes are tender.

How can I tell if the gratin is done?

The gratin is done when the top is golden brown and the potatoes are tender when pierced with a fork.

Can I store leftover potato and leek gratin?

Yes, store any leftovers in an airtight container in the refrigerator for up to 3-4 days. Reheat in the oven or microwave before serving.

What can I substitute for prosciutto in this recipe?

You can substitute prosciutto with cooked bacon, pancetta, or a vegetarian option like sautéed mushrooms for a similar flavor and texture.

What type of potatoes work best for gratin?

Starchy or waxy potatoes, like Russet or Yukon Gold, are ideal for gratin as they hold their shape and create a creamy texture when baked.

Tips:

- Precook the leeks and potatoes: For an evenly cooked gratin, consider precooking the leeks and potatoes slightly by sautéing the leeks until tender and parboiling the potatoes before layering them in the baking dish.

- Use a mandolin for even slices: To ensure uniform cooking, use a mandolin to slice the potatoes evenly. This will also help achieve the desired texture for your gratin.

- Layer for best flavor distribution: Layer the ingredients thoughtfully by placing a mix of leeks and prosciutto between the potato slices. This ensures every bite is packed with flavor.

- Check for seasoning: Taste your mixture before adding it to the baking dish. Cheese and prosciutto can be quite salty, so you may not need to add much additional salt.

- Let it rest: Allow the gratin to rest for a few minutes after baking. This helps the dish to set and makes it easier to cut clean portions.

- Customize with other cheeses: Feel free to experiment with different cheeses like Gruyère or Parmesan for an added depth of flavor.

Nutrition per serving

4 Servings
Calories 270kcal
Protein 12g
Carbohydrates 33g
Fiber 3.76g
Sugar 5g
Fat 10g

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