01 - Grease a 9x13-inch baking pan and line with parchment paper, leaving an overhang for easy removal.
02 - In a medium saucepan, melt butter over medium heat; cook, stirring, until it becomes deep golden and develops a nutty aroma. Immediately transfer to a large bowl and cool for 5 minutes.
03 - Whisk both sugars into the cooled browned butter until well combined. Add eggs and vanilla extract; whisk until smooth.
04 - In a separate bowl, sift together flour, baking powder, and salt. Stir this mixture into the wet ingredients until just incorporated.
05 - Gently fold in chopped cherries and white chocolate until evenly distributed throughout the batter.
06 - Spread batter evenly in the prepared pan. Sprinkle lightly with flaky sea salt. Bake at 350°F (175°C) for 28-32 minutes, or until edges are golden and top is set.
07 - Allow blondies to cool completely in the pan, then lift out using parchment overhang and slice into squares.