Mix the butter, sugar, vanilla sugar and the two eggs together to form a smooth dough. Then mix the flour with the baking powder, gradually adding it. Add the milk at the end, not all at once. Now stir with the mixer until a creamy dough is formed. Pour the batter into a prepared cake pan.
Bake in the preheated oven at 175 ° C for 20 minutes.
After cooling, the floor can be covered as desired.