Preheat the oven at 180 degrees Celsius.
Mix the butter, sugar, and vanilla sugar together in a bowl.
Add the hazelnut flour and mix.
Add the flour and mix well.
On a plain surface roll out the dough thin and cut out cookies with a cookie cutter.
Place the cookies on a silicon mat on a baking sheet.
Place in the middle of the oven for 10 minutes.
Take out the cookies and let cool down in room temperature.