Preheat the oven to 350F. Line an 8X8-inch baking pan with parchment paper. Lightly grease the pan and the parchment paper with cooking spray or butter
Melt the butter in a small saucepan over medium heat. As the butter melts it will start to bubble fast, continue stirring it until it starts to foam and its color changes from a lighter yellow to a nice golden brown color. Take the pan off the heat as soon as you smell the nutty aroma.
In a bowl add the brown sugar and pour the brown butter over. Whisk for three minutes. Let sit for five minutes.
Whisk in the egg and vanilla until well combined.
In a separate bowl, whisk together the flour, baking powder, and salt. Add the dry mixture to the wet mixture and fold until well incorporated. Fold in the strawberries, and white chocolate chips, and pour the batter into the parchment-lined baking pan.
Using a spatula, spread the batter evenly so that it is in every corner.
Bake for 30 to 35 minutes or until a toothpick inserted in the center comes out with just a few crumbs. The edges will look well baked and firm, the center will moist but not too gooey. Cool in the pan for 15 minutes then transfer it to a wire rack.
You can store these Brown Butter Strawberry Blondies in an airtight container at room temparature for up to 3 days or in the fridge for up to 7 days.