Warm the milk lukewarm. Dissolve yeast in it. Put flour, sugar, vanillin sugar, salt, eggs, quark and soft fat in a bowl. Add yeast milk and knead with the dough hooks of the hand mixer. Add raisins and work everything into a smooth yeast dough. Cover and leave to rise in a warm place for 30 minutes. Knead the dough again well and form 35 round balls.
Let the balls rise for another 15 minutes. In the meantime heat the cooking fat in a pot to 180 degrees. If necessary, re-form the balls and bake in hot fat until golden (about five minutes on each side). Remove with a skimmer. Drain on kitchen paper and let it cool down. Dust the doughnuts with icing sugar and decorate with colourful sugar sprinkles. Serve on a plate while still fresh