Melt the butter and let it cool down a little. Roughly chop the chocolate. Mix flour, sugar, cocoa, espresso, baking powder and vanillin sugar in a bowl. Place the eggs in a mixing bowl and whisk with the whisk of the hand mixer for about 5 minutes until creamy. Allow butter to run in and stir in. Mix in the flour mixture well with a mixing spoon. Stir in sour cream, then fold in chocolate.
Fill the dough into 2 greased muffin trays (each with 12 troughs) sprinkled with flour. Bake one after the other in a preheated oven (electric oven: 175 °C/ convection oven: 150 °C/ gas: stage 2) for 25-30 minutes. In the meantime, knead the marzipan with approx. 5 g icing sugar and food colouring, roll out and cut out approx. 24 cloverleaves (3.5 cm Ø). Remove the muffins and let them cool down. Dust with approx. 20 g icing sugar. Decorate with cloverleaves
Waiting time approx. 1 hour