Preheat your oven to 350°F (180°C). Line a cake tin with parchment paper.
Separate the eggs. In a bowl, whisk the egg yolks with the sugar until pale and fluffy. Add the melted butter and milk.
In a separate bowl, combine the flour and baking powder. Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Stir in the sweetened chestnut purée.
In a clean bowl, whisk the egg whites until stiff peaks form. Gently fold the egg whites into the batter.
Pour the batter into the prepared cake tin and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool completely before slicing it in half horizontally.
Whip the whipping cream until stiff peaks form. Spread a generous layer of whipped cream between the cake layers and a thin layer on top of the cake.
Melt the dark chocolate and drizzle it over the top of the cake as decoration. Refrigerate until the chocolate sets.
Before serving, decorate with additional sweetened chestnut purée or chocolate shavings, if desired.
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