Mix the quark, lemon and vanilla flavor, milk, oil, rum, salt, sugar and vanilla sugar in a bowl with a whisk.
Mix the flour with the baking powder, add to the quark mixture and mix well with your hand. Knead the dough well, roll it into a sausage and divide into 8 pieces. If it`s too sticky, just add a little flour. Now work in the rock candy and then shape the dough into rolls.
Mix the egg yolks with the powdered sugar, add half a bottle of vanilla flavor and brush the rolls with it.
Bake the rolls at 175 ° C for about 20 minutes
Instead of the rock candy, you can knead chocolate chips into the dough.