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Whisk eggs, sugar, and vanilla sugar until airy.
Melt butter and chocolate in a pan over low heat and fold it into the egg mixture.
Sift cocoa, flour, baking powder, and salt into the batter and fold around.
Fold in milk.
Stir into a smooth batter.
Stir in the chopped chocolate.
Distribute the batter into paper liners, preferably placed in sturdy muffin forms.
Bake at 175 degrees Celsius (347 degrees Fahrenheit) (fan) for 15-17 minutes.
Frosting
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While they are baking, you can make the frosting:
Mix butter, powdered sugar, and cocoa well with a hand mixer.
Carefully fold in cream cheese and melted chocolate until smooth and glossy.
Place in a piping bag with a star nozzle and refrigerate until ready to use.
Once the cupcakes have cooled completely, cut a hole in the center of each one.
Remove excess cake from the hole and fill it with Nutella, about 1 tsp each.
Decorate with the frosting and serve ?