Preheat your oven to 350°F (180°C) while preparing the batter.
In a large bowl, whisk together the flour, sugar, baking powder, salt, and vanilla sugar.
In a separate bowl, whisk the eggs, then add the oil and milk. Mix until smooth.
Add the quark to the wet ingredients and gently fold it into the mixture.
Gradually add the wet ingredients to the dry ingredients, mixing until you have a smooth, lump-free batter.
Gently fold in the fresh raspberries, being careful not to crush them completely.
Divide the batter into muffin cups, filling each about 2/3 full.
Bake the cupcakes for 20-25 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Let the cupcakes cool completely before frosting.
Whip the heavy cream until stiff peaks form, then fold in the powdered sugar. Spoon the frosting onto the cupcakes and garnish with fresh raspberries.
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