Measure the flour into a large bowl, add the powdered sugar and vanilla sugar. Mix thoroughly.
Add the butter to the dry ingredients and rub it in with your hands until you get a homogeneous, crumbly mixture.
Add the egg yolks and sour cream, then knead the dough until it is smooth and elastic.
Wrap the dough in plastic wrap and refrigerate for at least 30 minutes.
On a lightly floured surface, roll out the chilled dough to about 3 mm thick. Cut out circular shapes.
Place a small spoonful of apricot jam in the center of each circle, then fold them in half and gently press the edges together.
Place the crescent cookies on a baking sheet lined with parchment paper and bake in a preheated oven at 350°F (180°C) for about 15 minutes, or until lightly golden brown.
Remove the cookies from the oven and let them cool slightly, then while still warm, toss them in powdered sugar to coat them well.
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