Preheat your oven to 350°F (180°C, or 320°F/160°C for convection ovens). Prepare a 12-cup muffin tin with liners.
Melt the butter and mix it with the granulated sugar and vanilla sugar until you have a creamy mixture.
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 this to the butter mixture.
Gradually add the milk, mixing continuously, until you have a smooth batter.
Gently fold in the fresh blueberries, being careful not to crush them.
Fill the muffin liners with batter, then bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
Once baked, let them cool in the tin for 5 minutes, then transfer them to a wire rack to cool completely.
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