Preheat your oven to 350°F (180°C) while preparing the batter.
In a large bowl, whisk together the flour, sugar, cocoa powder, baking powder, salt, and vanilla sugar.
In a separate bowl, whisk the eggs, then add the oil and milk, mixing until smooth.
Gradually add the wet ingredients to the dry ingredients, mixing until you have a smooth, lump-free batter.
Place a whole Oreo cookie at the bottom of each muffin liner, then pour some batter over it.
Place half an Oreo cookie in the center of the batter, then cover with the remaining batter.
Bake the cupcakes for 20-25 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Allow the cupcakes to cool completely before decorating.
Whip the heavy cream until stiff peaks form, then mix in the powdered sugar to create a sweet, light frosting.
Pipe or spoon the frosting onto the cupcakes and decorate with crushed Oreo cookie pieces.
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