1-First: preheat the oven to 350°F (175°C) and grease the sides of a 10-inch springform pan. Line the bottom with baking paper to prevent sticking.

2-Next: peel, core, and slice the apples into medium-thickness pieces, setting them aside for later.

3-In a bowl, whisk the eggs and granulated sugar together until smooth and creamy.

4-Sift in the all-purpose flour, baking powder, vanilla sugar or extract, and salt, then stir to make a smooth batter.

5-Melt the butter and mix it with the milk, then add this to the batter and stir until fully combined.

6-Spread the batter evenly in the prepared pan and arrange the apple slices in circular patterns on top, letting them sink slightly.

7-Sprinkle the brown sugar and cinnamon evenly over the apples for that classic topping.

8-Bake for about 45 minutes, or until a toothpick inserted in the center comes out clean. Let the cake cool completely before removing it from the pan.