Preheat oven to 350°F (180°C) and line a muffin tin with paper liners.
In a medium bowl, whisk together the flour, cocoa powder, baking powder, and salt.
In a separate bowl, cream together the softened butter and granulated sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
Stir in the vanilla extract, then gradually add the dry ingredients to the wet ingredients, alternating with the milk.
Melt the dark chocolate and gently fold it into the batter.
Gently fold in the fresh raspberries, being careful not to crush them.
Fill the muffin liners about three-quarters full and bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Let the cupcakes cool completely on a wire rack before frosting.
For the frosting, whip the heavy cream until stiff peaks form. Add the mascarpone cheese and powdered sugar, and continue to whip until smooth and creamy.
Using a piping bag, decorate the cupcakes with the frosting. Garnish with fresh raspberries and grated chocolate.
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