For the stuffed puff pastry, mix flour, butter, sugar, curd cheese, salt and egg yolks to a smooth dough. Let the dough rest for about 30 minutes, then roll out to 2-4 mm thick.
Roll out 8 x 8 cm squares, put half a coffee spoon of jam in the center of the square, fold in and press the edges firmly together, brush with egg.
Bake at 180 °C top and bottom heat (or 170 °C hot air) for about 15 minutes until golden brown. Sprinkle with powdered sugar while still hot and serve.