First, preheat your oven to 350°F (180°C) so it reaches the desired temperature while you prepare the batter.
In a bowl, whisk the eggs and sugar together until light and fluffy. You can use a whisk or an electric mixer.
Add the oil, milk, and vanilla sugar, then mix well to combine.
In a separate bowl, whisk together the flour, cocoa powder, baking powder, and a pinch of salt. You can add all the dry ingredients without sifting, but sifting helps to avoid lumps.
Gradually add the dry ingredients to the egg mixture, mixing constantly until you have a smooth, lump-free batter.
Divide the batter evenly into muffin liners, filling them about 2/3 full to allow room for rising.
Bake the cupcakes for 20-25 minutes, or until a toothpick inserted into the center comes out clean. They are ready when the tops are lightly puffed and golden brown.
Once the cupcakes have cooled completely, prepare the truffle filling. Chop the dark chocolate into small pieces and melt it in a heatproof bowl. Once melted and smooth, add the heavy cream and stir until well combined and creamy.
Spoon the prepared truffle cream into the center of the cupcakes, smoothing the top. Let them rest for a short time to allow the truffle filling to set.
If desired, you can decorate the tops with grated chocolate or small pieces of dark chocolate.
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