Preheat your oven to 320°F (160°C). Line a 8-inch (20cm) cake pan with parchment paper.
In a clean bowl, whisk the egg whites with the sugar until stiff peaks form. Gently fold in the almond flour.
Pour the batter into the prepared cake pan and bake for 25-30 minutes, or until a toothpick inserted into the center comes out clean. Let cool completely in the pan.
Grate the marzipan. In a separate bowl, combine the grated marzipan with the heavy cream and powdered sugar. Whip until light and creamy.
Place the cooled cake layer on a serving plate. Spread the marzipan cream evenly over the top and sides of the cake.
Decorate the cake with chocolate shavings and marzipan figures, if desired. Refrigerate for at least 2 hours to allow the cream to set.
Before serving, slice the cake and dust with powdered sugar for a beautiful presentation.
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