Preheat your oven to 350°F (175°C). Grease an 8x8 inch baking pan or line it with parchment paper for easy removal.
In a mixing bowl, combine the granulated sugar and melted butter. Whisk them together until well blended.
Add the eggs, one at a time, whisking until fully incorporated. Stir in the vanilla extract.
In another bowl, whisk together the all-purpose flour, baking powder, and salt.
Gradually fold the dry ingredients into the wet mixture using a rubber spatula until just combined. Do not overmix.
Gently fold in the white chocolate chips and raspberries, being careful not to break the raspberries.
Pour the batter into the prepared baking pan and spread it evenly.
Bake in the preheated oven for 22-25 minutes or until a toothpick inserted in the center comes out clean or with a few moist crumbs.
Allow the blondies to cool in the pan for about 10 minutes before transferring them to a wire rack to cool completely.
Once cooled, cut into 12 squares and enjoy!