First make dampfl from yeast, milk and sugar and a little more.
When the dampfl has risen well, knead in the remaining dough ingredients. Let the dough rest for 1 hour.
In the meantime, mix the filling well. Roll out the dough to the thickness of a knife, cut into squares and cover with filling.
Shape into croissants and brush with beaten egg. Bake at 200 °C for about 20 minutes.
After half the baking time, brush again and bake until done.