Defrost the blueberries and puree them finely. Finely chop the chocolate. Mix quark with vanilla sugar. Mix in chocolate. Fold in blueberry puree loosely.
Rinse the muffin tray with cold water using small troughs (approx. 25 ml each). Pour in the curd blueberry mixture. Insert the wooden or plastic handles. Freeze the ice cream for about 1-2 hours. Carefully remove the ice from the muffin wells for consumption.