Mix eggs and sugar together and whip it light and fluffy.
Mix milk and butter together and warm it until it is a bit hot.
Mix flour, baking powder and vanilla sugar together with the whipped egg and sugar.
Gently turn it into the milk mixture.
Pour the dough into a small frying pan about 5 x 22 x 30 cm coated with baking paper,
and bake the cake in the middle of the oven.