Preheat the oven to 350°F (180°C). Grease and flour a 9-inch (22cm) cake pan.
Separate the eggs. In a clean bowl, whisk the egg whites with a pinch of salt until stiff peaks form.
In a separate bowl, cream together the egg yolks, granulated sugar, and vanilla sugar until light and fluffy. Gradually add the melted butter and milk.
Mash the chestnut puree with a fork and add it to the egg yolk mixture.
Combine the almond flour and baking powder, then gradually add to the chestnut mixture.
Gently fold in the beaten egg whites, being careful not to deflate the batter.
Pour the batter into the prepared cake pan and spread evenly.
Bake in the preheated oven for about 35-40 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Remove from the oven and let cool completely in the pan before inverting onto a serving plate. Decorate with flaked almonds and dust with powdered sugar.
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