Preheat your oven to 180C / 350F and line a 20x20 cm baking pan with parchment paper.
Microwave the white chocolate and the butter together until just melted.
½ cup butter, ⅓ cup white chocolate
In a mixing bowl, mix together flour, baking powder, salt, brown sugar and granulated sugar until mix well.
½ cup granulated sugar, 1 cup all purpose flour, ½ tsp baking powder, ¼ tsp salt, ½ cup light brown sugar
Mix in eggs, vanilla and the melted chocolate mixture.
2 large eggs, 1 tsp vanilla extract
Now, stir in half of the chocolate chunks.
⅔ cup white chocolate chunks
Pour the batter into the baking pan and then scatter the remaining chocolate chunks and the raspberries over the top. Gently push down into the batter.
1 cup fresh raspberries
Bake for 35-40 minutes and then allow to cool completely before cutting.
Notes
I highly recommend using fresh raspberries because they have better flavor and texture.
Do not overmix the batter to achieve a fudgy and moist texture.