Preheat oven to 350°F (180°C), or 320°F (160°C) for convection ovens. Prepare a 12-cup muffin tin with cupcake liners.
Melt the butter. In a mixing bowl, cream together the melted butter, sugar, and vanilla sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
In a separate bowl, whisk together the flour, cocoa powder, and baking powder. Gradually add the dry ingredients to the wet ingredients.
Add the red food coloring and vinegar, mixing until the batter is a vibrant red color.
Gradually add the milk, mixing until just combined and the batter is smooth.
Fill the cupcake liners about 2/3 full with batter. Bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
Let the cupcakes cool in the muffin tin for 5 minutes before transferring them to a wire rack to cool completely.
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