Peel potatoes, wash them thoroughly and cut them into very thin slices or hop. Grease 4 small or 1 large gratin dish, place potatoes in a fan shape and sprinkle each layer with salt and pepper.
Pour on the cream evenly. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 40-50 minutes. If necessary, cover with aluminium foil after about 30 minutes of baking time.