In a bowl, add the sifted wheat flour, add the baking powder, the vanilla sugar and the unsalted butter.
Flour the butter stick and grate it.
Next, mix all the ingredients well.
Add the milk, the sugar, the salt and the eggs, mix very well again.
Now transfer the dough to a plastic bag, take it to the fridge and let it rest there for about 20 minutes.
After this indicated time, remove from the fridge and transfer the dough to a floured sheet of parchment paper.
Stretch out the dough gently, cut ¼ of it, shape it into a ball and set aside.
Stretch out the rest of the dough until it reaches a 35cm diameter.
Now, using a 22cm diameter pan lid, make a circular mark on the dough.
Cut the outer part of this markup into thin strips and braid them.
After that, get the dough we set aside, stretch it out, cut into strips and set aside.
Now, fill the center of the pie with the jam.
Get the dough strips and place them over the jam, braiding them.
Mix the beaten egg with the milk and spread this mixture all over the dough.
Take to a preheated oven at 180°C (356°F) and bake for 30 minutes.
Serve.