Preheat your 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 and combine it with the granulated sugar and vanilla sugar until light and 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.
Slowly add the milk, mixing until just combined and a smooth batter forms.
Dice the fresh strawberries into small pieces and gently fold them into the batter.
Fill the cupcake liners with the 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, then transfer them to a wire rack to cool completely.
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