While very similar to brownies, blondies are made from brown sugar and feature white chocolate chips. These brown butter blondies are especially flavorful because of the addition of the brown butter. It does take a bit of extra time on the stove, but the result is well worth it!
Preheat oven to 350°F. Grease a 9 x 9-inch baking dish and set it aside.
In a small skillet, melt the butter over medium heat. The butter will foam, but continue to cook until the foaming lessens, 4-5 minutes. Once the foaming quiets down, cook the butter until specks of golden brown amass in the butter and it smells toasty, 3-4 minutes. Remove the butter from the heat and cool for 10 minutes.
Once the butter has cooled, combine with the brown sugar and whisk. Add the eggs and vanilla extract. Whisk until smooth. Add the flour, salt, and baking powder. Fold together until mostly combined with a few dry streaks remaining. Fold in the white chocolate chips.
Evenly spread the batter into the prepared baking dish. Bake in the preheated oven until the edges are set and the center is slightly gooey when inserted with a skewer, 35-40 minutes.
Remove the blondies from the oven and cool for 30 minutes before slicing and serving.