Preheat your oven to 350°F (175°C).

Prepare a 9x13 inch baking pan by greasing it or lining it with parchment paper.

In a large mixing bowl, combine melted butter, brown sugar, and granulated sugar. Whisk until well combined. Add eggs and vanilla extract, whisking until smooth and creamy.

In a separate bowl, whisk together flour, baking powder, and salt.

Gradually add the dry mixture to the wet mixture, stirring gently until just combined. Fold in white chocolate chips and raspberries carefully.

Pour the batter into the prepared baking pan and spread evenly. Bake for 25-30 minutes until edges are golden brown and a toothpick inserted in the center comes out clean.

Let the blondies cool in the pan for 10 minutes, then transfer to a wire rack to cool completely before cutting into squares.