In a large bowl, combine the all-purpose flour, dry yeast, sugar, vanilla sugar, and a pinch of salt.
Warm the milk slightly, then gradually whisk it into the dry ingredients.
Add the beaten eggs and melted butter, and stir until you have a smooth batter.
Cover the bowl and let the batter rise in a warm place for 30 minutes.
Preheat a poffertjes pan over medium heat and lightly grease it with butter.
Fill the small indentations of the pan with batter, being careful not to overfill them.
Cook for 1-2 minutes, until the bottoms are golden brown, then flip them over with a fork or skewer.
Cook for another minute on the other side, then remove and transfer to a plate.
Dust generously with powdered sugar and serve fresh with butter or fruit jam.
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