Preheat oven to 350°F (180°C). Grease and flour a cake pan.
In a large bowl, whisk together the flour, cocoa powder, and baking powder.
In another bowl, cream together the butter and granulated sugar until light and fluffy. Beat in the eggs one at a time.
Melt the dark chocolate over a double boiler or in the microwave. Add it to the egg mixture.
Add the milk, then gradually mix in the dry ingredients until just combined. Do not overmix.
Pour the batter into the prepared pan and bake for 30-35 minutes, or until a wooden skewer inserted into the center comes out clean. Let it cool completely in the pan before frosting.
For the frosting, whip the heavy cream until stiff peaks form. Gently fold in the powdered sugar and the remaining melted chocolate.
Frost the top and sides of the cooled cake with the chocolate cream, smoothing it out evenly.
Decorate the cake with colorful mini candies and edible pearls, scattering them over the top and sides.
Refrigerate the cake for at least an hour to allow the frosting and decorations to set. Slice and serve.
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