Thinly sliced potatoes, milk, cream, a hint of garlic and nutmeg, and 40 minutes at 160 °C in the basket.
Open the basket and you’re greeted by a top mottled with gold and brown, with the aroma of hot cream and garlic rising before the dish even reaches the table. Underneath, the slices have melted into one another without losing their shape, and the tip of a knife slips through the center effortlessly. No cheese, no béchamel : just potatoes, milk, and cream coming together. For a two-serving gratin, the air fryer makes far more sense than turning on a full-size oven.
What is gratin dauphinois?
It’s made with raw potatoes sliced 2 to 3 mm thick, milk, pouring cream, garlic, salt, pepper, nutmeg, and a little butter to grease the dish. The word gratin refers to the crust that forms on the surface. “Dauphinois” ties the dish to the Dauphiné, in southeastern France.
Cheese has no place in it. Add grated Gruyère on top and you have a gratin savoyard, which is a different dish. The thickening doesn’t come from egg or flour either : it’s the starch released by the potato slices that thickens the milk and cream as they cook. Which leads to the rule that surprises people most : never rinse the potatoes after slicing them.
From the Dauphiné to the air fryer basket
The dish comes from the Dauphiné, where it was made with whatever was on hand : potatoes, milk, cream, and a few aromatics. It was served piping hot, straight from the baking dish, alongside roasted meats and family meals.
The air fryer changes the scale rather than the recipe. Two portions in a small dish, 40 minutes at 160 °C, and convection that browns the top faster than a conventional oven. The proportions and the method, however, stay the same.
Main ingredients in gratin dauphinois
500 g of firm-fleshed potatoes that turn meltingly tender as they cook form the layers and provide the starch that binds everything together. Princesse Amandine, Charlotte, and Belle de Fontenay hold their shape well when sliced. Bintje gives a creamier but more delicate result, while floury varieties tend to fall apart. Slice them evenly to 2 or 3 mm, preferably with a mandoline.
10 cl of milk and 15 cl of pouring cream make up the liquid base. Milk alone gives a lighter texture that slices more neatly; the cream adds the fat that stabilizes it. Distribute the 6 pinches of salt, 6 turns of pepper, and 6 pinches of nutmeg layer by layer, otherwise the center will taste bland and the surface overly salty.
The half clove of garlic is for rubbing the dish, not for adding to it : at 160 °C, chopped garlic burns and turns bitter. The 5 g of butter coats the base and sides, makes serving easier, and helps the crust brown.
Technical pointers
The dish itself is key. Use ceramic, Pyrex, or silicone that can withstand 200 °C, small enough to let air circulate around it, and shallow enough to sit about 2 cm below the heating element.
The liquid should just come up to the level of the potatoes, not submerge them. Too little, and the edges dry out. Too much, and the cream won’t thicken properly.
If the top browns too quickly, cover it with a sheet of aluminum foil secured tightly to the rim of the dish, otherwise the airflow will lift it.
The only reliable test is the tip of a knife inserted into the center : it should slide in without resistance. The color on top tells you nothing about the middle.
Let it cool slightly before serving : the cream sets and the portions hold together. To reheat, give it 8 to 10 minutes at 140 °C, then 2 minutes at 160 °C to crisp up the top again.
Ingredients
Potatoes
- 500 g firm, waxy potatoes
For the baking dish
- 0,5 clove garlic
- 5 g butter
Seasoning
- 6 pinches ground nutmeg
- 6 pinches salt
- 6 grinds black pepper
Cream mixture
- 10 cl milk
- 15 cl heavy cream
Instructions
Preparation
- Wash and peel the potatoes.500 g firm, waxy potatoes
- Slice the potatoes very thinly with a mandoline or a very sharp knife. Do not rinse the slices after cutting.
- Rub the baking dish with the half clove of garlic, then butter the bottom and sides.0,5 clove garlic, 5 g butter
Assembly
- Arrange a layer of potato slices, overlapping them slightly, then season with salt, pepper, and nutmeg. Repeat, alternating layers and seasoning, until all the potatoes are used.6 pinches ground nutmeg, 6 pinches salt, 6 grinds black pepper
- Mix the milk and cream in a bowl, then pour over just until the liquid comes level with the top layer of potatoes.10 cl milk, 15 cl heavy cream
Air fryer cooking
- Place the dish in the air fryer basket and cook for 40 minutes at 160 °C.
- Check for doneness with the tip of a knife: it should slide into the center without resistance. If not, continue cooking.
Finishing
- Let the gratin cool slightly for a few minutes before serving, directly in the baking dish.
