Heat the milk in the microwave for approx. 2 minutes at 900 watts. Dissolve the coffee powder in it, crumble the chocolate and melt it in it.
Mix the yogurt, cream, liqueur, sugar, vanilla sugar and salt with the hand blender. Add the coffee mixture and whisk finely. Put in the ice cream maker and let freeze.
Can be portioned directly from the freezer compartment even after days.