Roughly chop the chocolate. Melt 125 g butter and chocolate in a saucepan over low heat while stirring, remove from the heat and pour into a mixing bowl. Add sugar, vanillin sugar, salt, eggs, flour and baking powder.
Mix to a smooth dough with the whisk of the hand mixer. Place 2 paper baking cups in each of the recesses of a muffin tray (12 recesses). Pour in the dough and bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 20 minutes.
Take the muffins out of the oven and let them cool on a cake rack. In the meantime wash and drain the currants. Chop the chocolate coating and melt it over a warm water bath, stirring occasionally.
Leave to cool for about 10 minutes. Beat 40 g butter and cream cheese until creamy with the whisk of the hand mixer. Add the chocolate coating and mix well. Fill the cream in a piping bag with star-shaped spout and squirt large tuffs onto the muffins just before serving.
Decorate with currant panicles.