French Potato and Leek Gratin in the Air Fryer

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29 December, 2025

French Potato and Leek Gratin in Air Fryer 🧀

Can you imagine coming home on a rainy Friday, opening the refrigerator and in 50 minutes having a gratin on the table so creamy and fragrant that it seems like you are in a small restaurant in Normandy?

That happened to me the first time I made this recipe. My boy came in, smelled the cider and the melted cheese and said: “Have you ordered food out?”… and I did it all with the air fryer and four potatoes! 😏

It is the typical dish that embraces the soul: very thin potatoes, sweet leek, cider that provides that fruity touch and a cheese crust that crunches when cut. Plus, it’s super easy and looks elegant even for a dinner with friends.

✅ Why this recipe is going to become your new obsession

✅ Only 15 minutes of active preparation and the rest is done by the fryer
✅ Use cider instead of white wine: softer and with that sweet touch that drives everyone crazy
✅ Much lighter than the classic gratin dauphinois (less cream, more flavor)
✅ The cheese crust is brutal thanks to the hot air circulating
✅ Perfect as a single dish with salad or as a luxury garnish
✅ Ideal for cold nights, impromptu dinners or when you want to impress effortlessly

French Potato and Leek Gratin in the Air Fryer

🥔 Ingredients you will need (for 4 people or 2 very very hungry)

4 large potatoes (better if they are floury, Kennebec or Monalisa type) 🥔
1 large leek 🧅
1 medium onion 🧅
1 clove of garlic 🧄
100 g grated parmesan cheese 🧀
150 g crème fraîche (or sour cream/cooking cream 35%) 🥛
100 g grated emmental cheese 🧀
150 ml of natural cider (the one you would drink, nothing industrially sweet) 🍎
Butter 🧈
Freshly grated nutmeg 🌰
Extra virgin olive oil 🫒
Salt and freshly ground black pepper 🧂

Optional extras:

A few slices of crispy bacon on top (sinful version)
100% natural gluten free
Vegan version: coconut cream + nutritional yeast + vegetable cheese

🍴 Essential equipment

Air fryer (works great in 4-7L)
Dish or mold suitable for 18-22 cm airfryer (metal or ceramic)
Mandolin or very sharp knife (essential for thin potatoes!)
Medium frying pan

Mise en place (10 minutes and you have everything ready): While you sauté the leek, peel and cut the potatoes. So then you just assemble and bake.

👩‍🍳 Step by step to get you out of a restaurant

Step 1: The stir-fry that changes everything Cut the leek into thin slices (only the white and light green part), the onion into julienne strips and the garlic into slices. Put 1 tablespoon of butter + a splash of oil in a cold frying pan and sauté over low heat for 15 minutes, covered. They have to be soft and sweet, almost candied. Stir occasionally so they don’t burn.

💡 Tip: Low heat is key, otherwise the leek is bitter. ⚠️ Be careful: do not turn up the heat, patience is flavor.

Step 2: Deglaze with cider (magical moment) Increase the heat, pour in the 150 ml of cider and scrape the bottom well. Let it reduce for 4-5 minutes until the alcohol almost disappears and a light syrup remains. The kitchen smells amazing!

Step 3: The most addictive cream in the world Off the heat, add the crème fraîche, 100 g of parmesan, half of the emmental, grated nutmeg (generous!), salt and pepper. Mix until you have a thick and shiny cream. Taste and adjust the salt, it has to be powerful.

Step 4: Perfect Potatoes Peel the potatoes and cut them into 2 mm slices (with a mandolin it takes a second and they are all the same). If you don’t have one, a sharp knife is also fine, but fine ones are fine.

Step 5: Assemble the gratin (pure art) Grease the dish well with butter. Alternate: layer of potatoes (slightly overlapping) → 2-3 tablespoons of cream → potatoes → cream… until finished. Press a little with your hand so that it is compact.

Step 6: Epic Coronation Top with the rest of emmental + a little more parmesan + black pepper. Optional: a few pieces of butter on top for extra shine.

Step 7: To the fryer and pray (a little) 160 ºC for 35-40 minutes. After minute 30, open and look: you want the potatoes to be tender (prick with a knife) and the surface to be golden and bubbly. If it browns too quickly, cover with aluminum foil for the last 10 minutes.

Take it out, let it rest for 5 minutes and enjoy the spoon moment!

🌟 Chef secrets to make it unforgettable

Cut the potatoes just before assembling so they don’t oxidize.
If you want more crust, the last 3 minutes increase to 180 ºC grill mode.
Brut or semi-dry cider is the key; the sweet one is cloying.
Press the layers well: this way it is compact and juicy inside.

❌ Typical errors and quick solutions Problem: It’s watery Cause: Very thick potatoes or little cider reduction Solution: Cut finer and reduce the cider to almost syrup.

Problem: It doesn’t brown on top Cause: Too much cream or too deep a fountain Solution: Use less cream in the last layer and distribute the cheese well.

🔥 Variations that are to die for

🍎 Cider + apple version: add thin slices of apple between layers. 🥓 Total Norman version: crunchy bacon crumbled on top. 🌱 Vegan version: oatmeal/coconut cream + vegetable cheese + nutritional yeast. 🧀 Four cheese version: add Gruyère and Comté. 🍺 Beer version: change cider for blonde beer.

🍽️ How to serve and make everyone applaud

Serve it directly on the platter, with a large spoon and a good arugula salad with mustard vinaigrette. Cold white wine or the same cider you used. You win for sure!

🥡 Storage and meal prep

🥡 Refrigerator: 3-4 days perfect (even improves the flavor). ♨️ Reheat: 10 minutes at 160ºC in an air fryer, it looks like it was freshly made. ❄️ Freeze: Yes, up to 2 months in portions.

❓ Questions you always ask me

Can I use regular cream instead of crème fraîche? Yes, but add a teaspoon of lemon to cut the fat.

And without alcohol? Replace the cider with vegetable broth + a splash of apple cider vinegar.

How many calories per serving? About 420-450 kcal, quite reasonable for what it comforts.

Hurry to do it before fall is over! 🍂

This gratin is pure love in every spoonful. I promise you that when you try it you will understand why in France they eat it even in summer. And on top of that, you can do it in the air fryer without dirtying the oven!

Make it this week, tag whoever you want to invite to dinner and show me your golden crust. I’m dying to see them all!