Oven-Baked Potato and Leek Gratin with Crispy Bacon

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Oven-Baked Potato and Leek Gratin with Crispy Bacon

Looking for a comforting, simple, and spectacular dinner from the very first slice? This oven-baked potato and leek gratin with bacon ticks all the boxes: ultra-creamy potato slices, tender and sweet leeks, and aromatic crispy bacon, all held together by an egg and cream mixture. Baked to perfection, the gratin boasts a golden, appetizing surface.

Why This Gratin is a Must-Have

This gratin succeeds because it adheres to three key principles of oven cooking:

• Thinly Sliced Potatoes: They cook to become tender while retaining enough structure to hold their shape.
• Well-Cooked and Drained Leeks: Their sweetness adds softness and aroma without making the dish soggy.
• Cream + Eggs + a Bit of Milk: This combination gives a creamy center, like a delicious custard.

The result? A well-coated filling, a creamy center, and a golden top thanks to the grated cheese. Moreover, letting it cool for a few minutes before slicing ensures clean, structured pieces.

What to Expect in Terms of Flavor, Texture, and Cooking

When your gratin comes out of the oven, you should find:

• A golden, gratin surface with slightly darker areas (this is normal; it’s the cheese caramelizing).
• A creamy heart that yields easily to a knife without being runny.
• Visible leeks that contribute green, tender notes without overpowering the dish.
• Rosy bites of bacon that bring out their smoky flavors, especially around the slices.

The key to successful baking lies in making sure the mixture sets properly. You’re not just reheating; you want the mixture to coagulate for the right texture.

Ingredients for the Gratin

These ingredients will help you achieve the perfect creamy and gratin texture:

• Thinly Sliced Potatoes: 1 kg of firm variety potatoes (like Charlotte), peeled if desired. They’re the backbone of the gratin.
• Leeks: 500 g, trimmed to include the white and light green parts. They add sweetness, moisture control, and flavor.
• Crispy Bacon: 200 g of smoked bacon. It gives the dish character and rich flavor.
• Onion or Shallot (optional): 1 onion (~150 g) or 1 small shallot, plus 1 clove of garlic for added aroma.
• Cream: 20 cl of crème fraîche or liquid cream for a delicious binding.
• Milk: 10 cl to create a softer texture.
• Eggs: 3 eggs for the vital binding that stabilizes the mixture.
• Grated Cheese: 150 to 200 g of cheese (like Gruyère, Comté, or Emmental) for a lovely crust.
• butter or Olive Oil: 20 g of butter or a drizzle of olive oil for greasing the dish.
• Seasoning: Salt, pepper, nutmeg (a pinch), and thyme (optional) to balance flavors.

Choosing the Right Ingredients

For a truly successful gratin, aim for high-quality ingredients that hold their shape and cook well.

• Potatoes: Choose a variety suitable for baking.
• Leeks: Select firm ones without wilted leaves and wash them thoroughly.
• Bacon: Opt for quality smoked bacon for enhanced flavor.
• Cream and Cheese: Use fresh cream and good-quality cheese for the best results.

Substitutions and Variations

You can replace certain ingredients while maintaining the core concept: thin slices, tender drained leeks, cream and egg binding, and cheese gratin.

• No smoked bacon? Use plain bacon or substitute with a less smoky flavor, adding a bit of thyme.
• No cream? Use extra milk and more cheese, though the creaminess will be less round.
• Different cheese? Gruyère, Comté, or Emmental all work well.
• Only white leeks? You can use just the white part for a milder flavor; include some tender green if possible.

Preparation: Getting Organized

To cook stress-free, prepare in advance:

• A preheated oven (set to the cooking temperature as per the recipe).
• A deep baking dish to accommodate the mixture.
• A mandoline or sharp knife for thinly slicing potatoes.
• A pan for cooking bacon and leeks.
• A bowl for preparing the mixture (cream, milk, eggs, seasonings).

Preparation Steps Before Assembling the Gratin

Before mixing, you need to:

• Thinly slice the potatoes for optimal creaminess.
• Chop the leeks and drain them to prevent excess moisture.
• Cook the bacon and leeks separately for flavor.
• Prepare the mixture by whisking cream, milk, and eggs with seasonings.

Step-by-Step Recipe Preparation

Preheat the Oven

Set the oven to 180°C (convection) or 190°C (static). A hot oven helps the mixture set properly.

Prepare the Vegetables

Thinly slice the potatoes (1 kg) to achieve even cooking. Chop the leeks (500 g) finely, washing them well if necessary.

Cook the Bacon

In a medium-high pan, cook the bacon (200 g) until golden and crispy, about 6 to 8 minutes. Set aside.

Sauté the Leeks

In the same pan, add the onion (optional) and cook until translucent, about 2 to 3 minutes. Then, add the chopped leeks and cook for another 8 to 12 minutes until tender. Drain thoroughly to remove excess moisture.

Assemble the Gratin

Generously butter a suitable baking dish. Layer half the potatoes, followed by leeks, bacon, and finish with the remaining potatoes.

Prepare the Cream Mixture

In a bowl, whisk together the cream (20 cl), milk (10 cl), and eggs (3). Season with salt (carefully), pepper, and a pinch of nutmeg.

Combine and Bake

Pour the mixture over the assembled dish. Bake for 55 to 70 minutes at 180°C, until set. If the top browns too quickly, cover with parchment paper.

Add Cheese and Finish Baking

Once cooked, increase the oven temperature to 200°C and sprinkle cheese (150 to 200 g) over the top. Bake for another 12 to 18 minutes until golden.

Let It Rest

Allow the gratin to cool for 5 to 10 minutes before serving for cleaner slices.

Serving and Storage

Serve the gratin warm, ideally avoiding extremes either way. For storage, refrigerate in an airtight container for up to 2 days. To reheat, place in the oven at 160–170°C for 15 to 25 minutes, or microwave portions as needed.

Conclusion

You now have the method to successfully prepare a delicious, creamy oven-baked potato and leek gratin with crispy bacon. Try it for a special meal, and keep this recipe on hand—it’s always a hit at the table!

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