In a large bowl, whisk together the flour, baking powder, and vanilla sugar.
In another bowl, cream together the softened butter and sugar until light and fluffy. Beat in the eggs one at a time, mixing well after each addition.
Grate the orange zest and squeeze the juice. Add both to the butter-egg mixture and stir to combine.
Mash the quark cheese with a fork, then add it to the orange mixture.
Gradually add the dry ingredients to the wet ingredients, then pour in the milk and mix until a smooth batter forms.
Pour the batter into a greased and floured Bundt pan, spreading it evenly.
Bake in a preheated oven at 350°F (180°C) for 40-45 minutes, or until a toothpick inserted into the center comes out clean.
Let the Bundt cake cool completely in the pan before carefully inverting it onto a wire rack.
Before serving, dust with powdered sugar or drizzle with an orange glaze.
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