Preheat the oven to 160 degrees C fan.
Oil the baking pan carefully - use a brush.
Grate the orange zest & squeeze the juice.
Mix butter, sugar, vanilla sugar & salt w/ the electric handheld mixer until well combined.
Add eggs & mix.
Add flour mixed w/ baking powder & mix.
Finally fold in the orange zest, 2 tbsp of the orange juice & the orange liqueur.
Add chocolate flakes.
Use the piping bag to distribute the batter equally in the 6 Bundt cake moulds.
Let it bake for 20 min in the preheated oven.
Don’t forget the famous test w/ the wooden pin ... If necessary add 3-4 min!
Let the small cakes cool own for about 5 min - then tip the baking pan carefully over & let the small Bundt cakes pop out.
Let them cool completely.
For the icing melt the chocolate in a bain-marie & distribute generously over the Bundt cakes.