- Preheat your oven to 350°F (175°C) and grease a 9×9 inch baking pan.
- In a large bowl, mix together the melted butter, brown sugar, and granulated sugar until well combined.
- Add the eggs and vanilla extract, mixing until smooth.
- In a separate bowl, whisk together the gluten-free flour, baking powder, and salt.
- Gradually add the dry ingredients to the wet ingredients, stirring until just combined.
- Fold in the blueberries and white chocolate chips gently.
- Pour the batter into the prepared baking pan and spread evenly.
- Bake for 25-30 minutes or until a toothpick inserted in the center comes out clean.
- Allow to cool before cutting into squares.
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