Carefully split the vanilla bean and scrape out the grain/seeds inside.
Slowly rub icing sugar onto the vanilla seeds using a knife or spoon and make sure they don't clump together.
Once the icing sugar is applied to the vanilla seeds, put them in a mixing bowl with wheat flour, graham flour, baking powder, and cardamom then mix them together.
After you mix the dry ingredients together, gently knead softened butter into the mixture.
Add eggs and milk into the mixture and stir them together until a dough is formed. Gradually add milk while you are mixing until everything is incorporated and you have a dough you can work with.
Refrigerate the dough for an hour (This is not absolutely necessary, but the dough is easier to work with when it is cold.)
Turn the oven to 180 ° C.
Roll small balls of dough and press them lightly flat with a fork.
Place the dough disks on a baking sheet lined with parchment paper, and bake them in the oven for approx. 15 minutes.
Let them cool slightly on a rack.
The cookies can be kept for a long time in a can or in a glass with a tight-fitting lid.