Preparation:
First, put the sugar and vanilla sugar into a bowl and whisk in the eggs.
Then mix the baking powder with the flour and gradually add it to the eggs, stirring continuously.
Now add the melted butter and mix well.
Next, peel and dice the apples, grease the baking dish, and add the apples (optionally sprinkle them with sugar or cinnamon).
Pour the batter over the apples and smooth the surface.
Place in the preheated oven at 180 °C (356 °F) and bake for 40–45 minutes (baking time may vary — check with a toothpick before removing the cake from the oven).
Finally, sprinkle the finished cake with powdered sugar.
