Prepare the ingredients. Melt the butter and whisk the eggs with the granulated sugar and vanilla sugar until light and fluffy.
In a bowl, combine the flour, baking powder, and a pinch of salt.
Add the whisked eggs, melted butter, milk, quark cheese, orange zest, and orange juice. Mix well until a smooth batter forms.
Grease and flour a cake pan, then pour in the batter.
Bake in a preheated oven at 350°F (180°C) for 35-40 minutes, or until the top is golden brown.
Once baked, check for doneness with a toothpick. If the toothpick comes out clean, the cake is ready.
Let the cake cool completely before slicing and serving.
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