Chopping chocolate. Drain mandarin oranges, catch the juice. Mix flour, baking powder, sugar and salt in a large bowl. Whisk eggs, oil and tangerine juice and add to the flour mixture with a wooden spoon, stirring gently. Fold 100 g chocolate and mandarin oranges into the dough. Line a muffin tin (12 troughs of 7 cm Ø each) with paper cups and spread the dough inside. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: level 2) for about 25 minutes.
Take out and let cool down. Melt 50 g chocolate on a hot water bath. Put a dab of chocolate on each muffin. Wash the clementine, dab dry and cut into 12 slices. Pour on the chocolate spots. Dust with icing sugar