Preheat the oven to 400°F (200°C).

Peel the apples, cut them into small pieces, and place them in lemon water as you go to prevent browning.

Drain the apple pieces in a colander and pat them dry before arranging them in the pan. Sprinkle with cinnamon.

In a mixing bowl, combine the flour, baking powder, granulated sugar, and vanilla sugar. Mix well, then add the melted butter and milk. Stir until you have a smooth batter. Add cinnamon and mix well.

Pour the batter over the apples and bake for 30 minutes. Check doneness with a knife; it should come out clean. Let cool before removing from the pan. Enjoy!