Put soft plums in a bowl and pour Madeira over them. Marinate overnight. Knead the flour, icing sugar, 1 teaspoon of cinnamon, butter flakes and egg yolks into a smooth dough. Wrap in foil and put in the fridge for about 30 minutes. Drain the soft plums.
Knead the marzipan and 1 teaspoon of cinnamon and form 35 small balls. Press one ball of marzipan into each soft plum. Roll out the dough on a floured work surface 4 mm thin. Cut out circles of dough (3 cm Ø) from it. Place the dough circles on 2 baking trays covered with baking paper. Bake the trays one after the other in a preheated oven (electric range: 175 °C/ convection oven: 150 °C/ gas: level 2) for approx. 10 minutes until golden brown. Cool down on a cake rack. Put a soft plum on each cookie. Place the side with the marzipan filling on the cookie and press down gently (so that the plum sticks to the cookie). Cut the chocolate coating into pieces.
Cool down on a cake rack. Put a soft plum on each cookie. Place the side with the marzipan filling on the cookie and press down gently (so that the plum sticks to the cookie). Cut the chocolate coating into pieces. Remove the cake glaze from the package, put it in a bowl with the couverture and melt it over a hot water bath. Finely slice the white couverture. Cover the plum cookies with the icing, decorate with the sliced couverture and leave to dry
waiting time approx. 13 hours