Preheat your oven to 350°F (180°C). Line a muffin tin with paper liners.
In a medium bowl, whisk together the flour, cocoa powder, baking powder, and salt until well combined.
In a separate bowl, cream together the butter and sugar until light and fluffy.
Beat in the eggs one at a time, then stir in the vanilla extract.
Gradually add the dry ingredients to the wet ingredients, alternating with the milk, mixing until just combined.
Melt the dark chocolate over a double boiler or in the microwave. Let it cool slightly, then fold it into the batter.
Chop the milk chocolate into small pieces and gently fold them into the batter, ensuring they are evenly distributed.
Fill the muffin liners about three-quarters full with batter. Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
While the cupcakes are baking, prepare the chocolate frosting: In a bowl, whip the heavy cream until stiff peaks form. Gently fold in the powdered sugar and cream cheese until smooth and creamy.
Let the cupcakes cool completely before frosting. Decorate with the chocolate cream and sprinkle with grated chocolate.
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