Leeks and Potatoes Au Gratin

Creamy, cheesy, and irresistibly indulgent, Leeks and Potatoes Au Gratin is the ultimate comfort food dish that’s perfect for family dinners or special occasions. This hearty recipe layers thinly sliced russet potatoes and caramelized leeks with a rich, velvety cheese sauce infused with garlic, thyme, and a hint of nutmeg. Topped with melted Gruyère, Parmesan, and golden, crunchy breadcrumbs, this casserole is baked to bubbly perfection. Easy to make yet deeply flavorful, this dish works beautifully as a show-stopping side for roasted meats or as a satisfying vegetarian main course. With a harmonious blend of textures and bold flavors, this gratin is a guaranteed crowd-pleaser.

Nutriscore Rating: 65/100

Prep Time:20 mins

Cook Time:60 mins

Total Time:80 mins

Servings: 6

Ingredients

• 4 large Russet potatoes
• 3 medium Leeks
• 4 tablespoons Butter
• 3 tablespoons All-purpose flour
• 2 cups Whole milk
• 1 cup Heavy cream
• 2 minced Garlic cloves
• 1 teaspoon Fresh thyme
• 0.25 teaspoon Ground nutmeg
• 2 cups Gruyère cheese
• 0.5 cups Parmesan cheese
• 1 teaspoon Salt
• 0.5 teaspoon Black pepper
• 1 tablespoon Olive oil
• 0.5 cup Breadcrumbs

Directions

Step 1

Preheat your oven to 375°F (190°C). Grease a 9x13-inch baking dish with butter or olive oil.

Step 2

Peel the potatoes and slice them thinly into 1/8-inch rounds. Wash the leeks thoroughly, trimming off the dark green tops and roots. Slice them into thin rounds.

Step 3

In a large skillet, heat 1 tablespoon of olive oil over medium heat. Add the sliced leeks and cook until soft and slightly caramelized, about 5-7 minutes. Set aside.

Step 4

In a medium saucepan, melt the butter over medium heat. Add the minced garlic and cook for 1 minute until fragrant.

Step 5

Whisk in the flour to create a roux and cook for another 1-2 minutes, stirring constantly. Gradually add the milk and heavy cream, whisking to remove any lumps.

Step 6

Stir in the thyme, nutmeg, salt, and black pepper. Bring the mixture to a gentle simmer and cook until slightly thickened, about 3-5 minutes.

Step 7

Remove the saucepan from heat and stir in half of the Gruyère cheese and the Parmesan until completely melted.

Step 8

Layer half of the sliced potatoes in the prepared baking dish. Top with half of the cooked leeks and pour half of the cheese sauce evenly over the layer. Repeat with the remaining potatoes, leeks, and cheese sauce.

Step 9

Sprinkle the remaining Gruyère cheese evenly over the top. For added crunch, combine breadcrumbs with a tablespoon of olive oil and sprinkle the mixture over the cheese.

Step 10

Cover the dish with aluminum foil and bake in the preheated oven for 30 minutes. Remove the foil and bake for an additional 20-25 minutes, or until the potatoes are tender and the top is golden and bubbling.

Step 11

Allow the dish to rest for 5 minutes before serving. Enjoy piping hot as a side dish or main course!

Nutrition Facts

Serving size	(2701.4g)

Amount per serving	% Daily Value*
Calories	4578.0

Total Fat 259.5g	0%
Saturated Fat 144.4g	0%
Polyunsaturated Fat 7.8g
Cholesterol 765.0mg	0%
Sodium 6200.1mg	0%
Total Carbohydrate 393.1g	0%
Dietary Fiber 29.4g	0%
Total Sugars 54.3g
Protein 160.6g	0%

Vitamin D 287.0IU	0%
Calcium 4138.3mg	0%
Iron 25.5mg	0%
Potassium 8353.2mg	0%

*The % Daily Value tells you how much a nutrient in a serving of food contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.

Source of Calories

Fat: 51.3%

Protein: 14.1%

Carbs: 34.6%