Grease your mold and dust it with a little flour or line the mold or tray with baking paper. I used a rectangular form with the dimensions 20 x 34cm.
Peel the apples, cut them into quarters and remove the core. Cut the apples into very thin slices or use a slicer, this is much faster (but watch your fingers). Squeeze the juice from the lemon and pour it directly over the apple pieces so that they don't turn brown.
Melt the butter in a saucepan and let it cool slightly.
Put eggs, vanilla sugar and sugar in a mixing bowl and mix everything with a hand mixer until creamy, until the sugar has dissolved and no longer crunches.
Now add the butter, flour, baking powder and milk and stir in the ingredients as briefly as necessary. Now fold in the apple slices and pour the batter into the prepared pan/sheet.
If you like, you can add almonds to the cake and bake it at 180°C convection oven for about 45 minutes. The apple cake should be nice and golden brown. If it gets too dark, cover it with some aluminum foil or something similar.
Dust the apple pie with powdered sugar before serving. It tastes especially good warm, but is also an absolute delight cold. You can serve it with whipped cream - but it tastes delicious without it.