Whisk the flour and baking powder together in a bowl. Set aside.
With a handheld or stand mixer fitted with a paddle or whisk attachment, beat the eggs, sugar and vanilla sugar on high speed in a large bowl until smooth and frothy. About 2 minutes
Add the flour mixture and oil in small amounts. Alternating between the two. Mix at medium speed until combined.
Pour in the 200 ml fanta. Stir in with a wooden spoon. Do not stir too much as the fanta might become flat.
Pour into the prepared baking tray and bake for around 20-25 minutes. The cake is done when a toothpick inserted in the center comes out clean. Leave to cool
To decorate
Sieve the icing sugar into a bowl. With a whisk - add the fanta in little portions, while stirring throughout. Once you achieve a thick and creamy mixture spread the icing over the cake with a palette knife of the back of the spoon.
Finally cover in sprinkles and leave the icing to set.
Notes
Prepare in advance & how to store the cake
This cake is nice and moist and will stay good for up to 5 days. This makes it a great cake to prepare in advance as it does not need to be cooled or stored in the fridge. Make sure to place it in an airtight container.