Preheat the oven at 175 degrees Celsius.
Starting by making the cake bottom. Butter a cake form and sprinkle the bread crumbles evenly in the form.
Mix the eggs and the sugar in a bowl with an electrical mixer.
Add the baking powder and the flour and mix gently.
Pour the batter in the baking form and place in the middle of the oven for 40 minutes.
Take out the cake bottom and let it cool down.
Divide the cake in 3 layers.
Time to make the filling. Whip the whip cream and the vanilla sugar to a hard foam.
Prepare the vanilla sauce according to the instructions on the package.
Mash the blueberries and mix with half of the whip cream. Do the same with the raspberries.
Place the bottom layer of the cake on a serving plate and spread evenly the vanilla cream.
Place the middle layer on top and spread evenly the blueberry mixture.
Place the top layer and spread evenly the raspberry mixture on top.
Roll out the marzipan lid and place gently over the cake.
Decorate the cake with some whip cream and decorations.