Preheat the oven the day before (electric cooker: 150 °C/circulating air: 125 °C/gas: see manufacturer). Grease a springform pan (20 cm Ø) and dust with flour. Coarsely grate the marzipan. Cream the grater with 100 g butter, sugar, vanilla sugar and 1 pinch of salt.
Stir in the eggs one by one. Mix 200 g flour and baking powder, stir in briefly.
Fill the dough into the springform pan and smooth it down. Bake in a hot oven for about 50 minutes. Take out and let cool down. Remove from the tin, wrap in aluminium foil and leave to stand overnight (this makes the cake juicier).
The next day, break the chocolate into pieces and melt it in a hot water bath. Let it cool down a little. Stir cream cheese and icing sugar with the whisk of the mixer until smooth. First stir in cream, then liquid chocolate bit by bit.
Hollow out the cake from above in the middle, round (approx. 12 cm Ø) and approx. 3 cm deep. (Use cake crumbs e.g. for rum balls). Spread the cake with the chocolate cream. Mix the chocolate crumble and sprinkle the cake with it.
Chill for about 30 minutes. Before serving, place dragee and chocolate eggs in the cake nest.