Preheat oven to 350°F (180°C). If using a convection oven, preheat to 320°F (160°C). Line a 12-cup muffin tin with cupcake liners.
Melt the butter and mix it with the sugar and vanilla sugar until creamy.
Add the eggs one at a time, mixing well after each addition.
In a separate bowl, whisk together the flour and baking powder. Gradually add the dry ingredients to the butter mixture.
Gradually add the milk while mixing, until a smooth batter forms.
Gently fold in the roughly chopped Oreo cookies.
Fill the cupcake liners with batter and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
Let the cupcakes cool in the tin for 5 minutes, then transfer them to a wire rack to cool completely.
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