Preheat the oven to 200°Mix the milk with the biscuits, the sugar and the vanilla sugar. Bring to the boil. Dissolve the vanilla powder in some water. Add to the milk and stir well. Take off the heat. Add all the eggs, one by one.Stir well. Grease a cake mould with butter.Pour the batter into the mouldSprinkle a lot of brown sugar onto it.Preheat an ovenPlace the cake in the oven.
Take out after half an hour at 180°C – 200°C.