Mix the marzipan with the egg white and powdered sugar until creamy.
Spread out the dough pieces on a floured work surface, spread a little marzipan cream on each one and roll up the dough towards the tip.
Whisk the egg yolks with milk, brush the croissants with it and sprinkle with flaked almonds. Bake in the preheated oven at 180 ° for about 15 minutes.