Wash potatoes well and wrap in aluminum foil. Roast in the oven at 200 °C hot air for about 1 hour.
In the meantime, mix all ingredients for the chive sauce and season with salt and pepper.
When the baked potatoes are done, open the foil, cut lengthwise with a knife and cover with the chive sauce.
Sprinkle freshly chopped chives on top and serve directly in the foil on preheated plates.