Preheat the oven to 350°F (180°C). Grease a 9-inch (22 cm) cake pan and line the bottom with parchment paper.
In a large bowl, whisk together the flour, cocoa powder, baking powder, and salt.
In another bowl, cream together the butter and granulated sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition.
Alternately add the milk and the flour mixture to the butter mixture, mixing until just combined.
Pour the batter into the prepared cake pan and bake for 35-40 minutes, or until a toothpick inserted into the center comes out clean.
While the cake is baking, prepare the chocolate cream: heat the heavy cream until simmering, then pour it over the finely chopped dark chocolate. Stir until smooth and glossy.
Let the cream cool slightly, then stir in the powdered sugar and vanilla sugar.
Once the cake has cooled, slice it in half horizontally. Spread the bottom layer with chocolate cream, then top with the other layer.
Frost the top and sides of the cake with the remaining chocolate cream, smoothing it evenly.
Refrigerate for at least 1 hour to allow the cream to set properly. Slice and serve.
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