Surprise Cupcakes

Directions

1. 1
   Preheat oven to 400 degrees Fahrenheit.
2. 2
   Melt 100 grams of butter and the dark chocolate in a double boiler.
3. 3
   In a medium-sized bowl, mix the eggs, sugar, and vanilla sugar. Add the melted butter and melted chocolate and stir to combine.
4. 4
   Mix the flour and baking powder and add them to the mixture.
5. 5
   Fill the muffin cups until half full.
6. 6
   Add a mini milk and hazelnut chocolate square in the center of each muffin. Cover with the remaining batter.
7. 7
   Bake for 15 minutes at 400 F.
8. 8
   For the vanilla icing, whisk 120 grams of softened butter in a bowl and gradually stir in the powdered sugar.
9. 9
   Add the vanilla extract and food coloring until obtaining the desired color.
10. 10
    Using a pastry bag, form a rosette of vanilla icing on top of each cooled muffin.
11. 11
    Then, place your cupcakes in the refrigerator to allow the icing to harden. Decorate according as you wish.