Preheat your oven to 350°F (180°C) while preparing the batter.
In a large bowl, whisk together the flour, sugar, cocoa powder, baking powder, salt, and vanilla sugar.
In a separate bowl, whisk the eggs, then add the oil and milk, mixing until smooth.
Melt the dark chocolate and stir it into the batter to achieve a rich chocolate flavor.
Gradually add the wet ingredients to the dry ingredients, mixing until you have a smooth, lump-free batter.
Divide the batter into muffin tins, filling each about 2/3 full.
Bake the cupcakes for 20-25 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Let the cupcakes cool completely before frosting with the chocolate cream and marshmallows.
Whip the heavy cream until stiff peaks form. Then, gently fold in the powdered sugar and a little melted chocolate to create a silky cream.
Spoon or pipe the cream onto the tops of the cupcakes, then garnish with marshmallows.
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