1. Preheat the oven to 175°C (350°F). Peel the apples and cut them into small pieces.
2. Mix them with the flour, vanilla sugar, baking powder, and cinnamon. In a separate bowl, whisk the egg, then stir in the oil, sugar, and quark.
``` 3. Finally, add the flour mixture to the egg mixture and quickly fold it in, then bake in a muffin tin for about 25 minutes.
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