Mix the flour, powdered sugar, salt, egg yolk and butter into a dough and shape into a ball. Wrap in cling film. Chill in the refrigerator for approx. 1 hour.
Shape the dough into 3 rolls and cut into thin strips. Shape each part into a ball and make a hole in the dough with the handle of the spoon. Brush the thalers with egg yolk and fill the hole with a dab of jelly.
Bake the thalers at 150 ° C on the middle rack for about 15-17 minutes.
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