Chop the chocolate finely. Cut the fat into pieces. Cream sugar, fat and vanilla sugar with the whisk of the hand mixer. Stir in the eggs one by one. Mix flour and baking powder and stir into the mixture alternately with the milk.
Stir in chocolate pieces. Grease the espresso cups and sprinkle with breadcrumbs. Put half of the dough into the cups. Stir espresso powder into the other half of the dough and also fill the cups. Marble the dough with a wooden skewer or fork. Bake the muffins in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 25-30 minutes. Place the muffins on a cake rack and let them cool down. Whip cream until semi-stiff. Before serving, put a blob of cream on each muffin and dust with cocoa.
Marble the dough with a wooden skewer or fork. Bake the muffins in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for 25-30 minutes. Place the muffins on a cake rack and let them cool down. Whip cream until semi-stiff. Before serving, put a blob of cream on each muffin and dust with cocoa. Decorate with mocha beans
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