Apple cake from Italy with 200ml sour cream that I bake 3 times a week

First make a foam mixture from butter, eggs and sugar.
Then stir in the flour mixed with baking powder, milk and grated lemon peel.
Pour this dough into a greased, crumbled springform pan or tart pan.
Now peel the apples, quarter them, score them and cover the dough with them along with the sour cream.
Bake at 185 °C for about 40 – 50 minutes, depending on the oven. Sprinkle the cooled cake with icing sugar. Enjoy!