Christmas baking #3 - Isler filled with walnut cream

I have always admired those bakers who can make those elegant pastries that you can get in the pastry shop. I thought I would try to see if I could make those wonderful pastries myself. I think it turned out pretty well. And they are not only beautiful, they are also delicious. And if I could do it, so can you. Your guests will surely be amazed when they find out that you made these little miracles for the Christmas party.
What you need:
300g of flour
100g of powdered sugar
200g of butter
40g of vanilla sugar
1 egg
salt
50g of ground walnuts
60g of butter
60g of ground walnuts
60g of powdered sugar
100g of chocolate
oil
chopped walnuts
Music:
The use of artist (Kevin MacLeod) Deck the Halls is licensed under the following license: Creative Commons - Name it! 4.0 creativecommons.org/licenses/...
Source: incompetech.com/music/royalty-...
Performer: incompetech.com/