Beat the butter and brown sugar together until light and fluffy.
Add the eggs one at a time.
In a separate bowl, combine the flour, baking powder and vanilla sugar then add to the wet ingredients and stir in.
Add the milk and continue to mix until everything is evenly dispersed (the batter will be thick).
Pour into the greased pan and spread the batter out towards the corners.
Place the prepared apples in a pretty pattern on top. Sprinkle with pearl sugar.
Bake for around 30-35 minutes.
Remove from the oven and serve warm or allow to cool completely. Enjoy!