Preheat the oven to 350°F (180°C) while preparing the batter.
In a large bowl, whisk together the flour, granulated sugar, cocoa powder, baking powder, salt, and vanilla sugar.
In a separate bowl, whisk the eggs, then add the oil and milk, and whisk until smooth.
Melt the dark chocolate, then stir in the peanut butter until you have a silky chocolate-peanut butter mixture.
Gradually add the wet ingredients to the dry ingredients, then gently fold in the chocolate-peanut butter mixture.
Divide the batter into muffin liners, 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 whisk in the powdered sugar and a little peanut butter until you have a creamy frosting.
Pipe or spoon the frosting onto the cupcakes, and decorate with chocolate shavings or chopped peanuts.
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