A great cake recipe for any occasion:
Peel apples, cut them into quarters and make light cuts using a fork.
Cream butter, add sugar and vanilla sugar and mix well. Combine flour and baking powder, sift and fold in. Add the milk and mix well.
Pour the batter into a greased springform pan, spread the apple quarters evenly on top and bake at 175 degrees (gas mark 3 to 4) for about 45 minutes.