Mix everything into a dough, cover, let rest in the fridge overnight

The next day, take out the dough from the fridge (it will be hardened). Cut into 4, and start kneading to warm up the dough, to be pliable again. Now you can either roll each, or once softened, you can add them as one again, then roll flat

Cut dough with round cookie cutter

Spoon jam in center, and fold sides into crescent

Bake cookies on preheated 350 F for 8-19 mins

Meanwhile, mix icing sugar with vanilla sugar

Once cookies are done, quickly coat them in sugar mixture