Pre-heat oven to 350 degrees; line an 8×8 or 9×9 baking dish with parchment paper and set aside
In a medium-sized saucepan over medium heat, brown the butter (stir butter constantly until it turns an amber/light brown color) and remove from heat
Whisk in sugar until well combined and set aside
In a medium bowl, whisk together flour, salt and baking powder; set aside
In a large bowl, whisk together eggs and vanilla; whisk in butter and sugar mixture
Whisk in flour mixture until almost combined and then fold in any remaining crumbs with a spatula
Fold in chocolate and blueberries until evenly distributed throughout batter
Pour into prepared baking pan
Bake for 35-40 minutes or until a knife comes out clean
Set aside to cool before cutting
Notes
Blondies will stay fresh for up to two days if wrapped or packaged in an air-tight container. They also freeze incredibly well, just wrap them tightly in tin foil.
Recipe by Keep It Sweet Desserts at http://www.keepitsweetdesserts.com/brown-butter-blueberry-chocolate-chunk-blondies/