Line the baking sheet with baking paper (if necessary, wipe the sheet with a damp cloth and then place the paper on it), preheat the oven to 200 - 220 degrees.
Separate the eggs and beat the egg white with cold water to a stiff snow, then gradually pour in the sugar and vanilla sugar. Thoroughly fold in the egg yolks with a whisk, and sift the flour with the baking powder lightly over it and fold in loosely until no more flour can be seen and a thick dough is formed. J
Place the dough on the prepared baking tray and bake in the oven for 8 to 10 minutes, until the dough looks golden yellow.