Pre-heat the oven to 350ºF (170°C) and prepare a muffin tray with cupcake cases.
In a large bowl whisk together the sugar and butter until it is nice and light.
Next, add the flour, cocoa, baking powder and vanilla sugar and continue to whisk just until everything is combined.
In a separate bowl, beat the egg and add the milk. Pour the liquid into the butter/flour mixture and mix until everything is well incorporated.
Bake in the middle of the oven for around 15-18 minutes. Cakes will be ready when a skewer comes out clean. Allow to cool completely on a wire rack before frosting.
For the frosting: sift the cocoa and icing sugar together then add to the cream cheese and beat until everything is well combined. Dollop some on each cupcake and then adorn them with anything you fancy (I used sprinkles, caramel sauce, Maltesers and chocolate). Stuff your faces and enjoy!