Preheat your oven to 350°F (180°C). Grease and line a 9-inch (22cm) cake pan with parchment paper.
Melt the white chocolate in a heatproof bowl set over a pan of simmering water (double boiler). Let it cool slightly.
In a large bowl, whisk together the flour and baking powder.
In another bowl, cream together the butter and sugar until light and fluffy. Add the eggs one at a time, beating well after each addition.
Stir in the vanilla extract and milk. Gradually fold in the dry ingredients and the melted white chocolate until just combined.
Pour the batter into the prepared cake pan and spread evenly.
Bake for 35-40 minutes, or until a wooden skewer inserted into the center comes out clean.
Let the cake cool in the pan for 10 minutes before transferring it to a wire rack to cool completely.
Before serving, dust with powdered sugar and garnish with fresh raspberries.
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