Preheat oven to 350°F (180°C) and grease a cake pan.
Cream together the butter and sugar until light and fluffy. Beat in the eggs one at a time, then stir in the vanilla extract.
In a separate bowl, whisk together the flour and baking powder. Gradually add the dry ingredients to the wet ingredients, alternating with the milk, until a smooth batter forms.
Pour the batter into the prepared cake pan and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean. Let cool completely in the pan before frosting.
For the truffle cream, heat the heavy cream until almost boiling. Pour over the finely chopped dark chocolate and stir until smooth. Refrigerate until chilled, then whip with an electric mixer until light and fluffy.
Slice the cooled cake in half horizontally and spread a generous layer of truffle cream between the layers. Frost the top and sides of the cake with the remaining cream.
Dust the top of the cake with cocoa powder and garnish with shaved chocolate or chocolate decorations.
Refrigerate the cake for at least 2 hours before serving to allow the flavors to meld.
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