Melt the dark chocolate over a double boiler, then let it cool to room temperature.
Cream the eggs and granulated sugar until light and fluffy, then gradually add the melted chocolate.
Sift together the flour, cocoa powder, and baking powder, then gently fold into the chocolate mixture.
Pour the batter into a greased and floured cake pan, and bake in a preheated oven at 350°F (180°C) for 35-40 minutes. Check for doneness with a toothpick.
While the cake is cooling, prepare the mascarpone cream: whisk together the mascarpone, powdered sugar, and vanilla extract until smooth.
Whip the heavy cream to stiff peaks, then gently fold it into the mascarpone mixture until light and creamy.
Cut the cooled cake in half horizontally, and fill with the mascarpone cream. Frost the top with the remaining cream, and smooth it out.
Garnish the cake with grated chocolate, cocoa powder, or fresh fruit for added visual appeal.
Refrigerate the cake for at least 2 hours to allow the flavors to meld and the cream to set.
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