Preheat the oven to 350°F (180°C). If using a convection oven, set the temperature to 320°F (160°C). Line a 12-cup muffin tin with cupcake liners.
Melt the butter, then whisk it together with the sugar and vanilla sugar.
Add the eggs one at a time, mixing well after each addition.
In a separate bowl, whisk together the flour, cocoa powder, and baking powder. Gradually add this dry mixture to the wet ingredients, mixing until just combined.
Slowly add the milk while mixing, until you have a smooth batter.
Gently fold in the chocolate chips.
Fill the cupcake liners about two-thirds full with batter. Bake for 18-20 minutes, or until a toothpick inserted into the center comes out clean.
Let the cupcakes cool in the tin for 5 minutes, then transfer them to a wire rack to cool completely.
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