Prepare the Brown Butter: In a saucepan over medium heat, melt the butter. Continue cooking, swirling the pan occasionally until the butter turns golden brown and develops a nutty aroma (about 5-7 minutes). Remove from heat and let it cool slightly.
Preheat the Oven: Preheat your oven to 350°F (175°C). Grease or line a 9x9-inch baking pan with parchment paper.
Mix the Batter: In a mixing bowl, whisk together the brown sugar and slightly cooled brown butter until well combined. Add the eggs and vanilla extract, mixing until smooth.
Combine Dry Ingredients: In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add this dry mixture to the wet ingredients, stirring until just combined.
Add Chocolate Chips:** Gently fold in the chocolate chips into the batter until evenly distributed.
Bake the Blondies: Pour the batter into the prepared baking pan and spread it evenly. Sprinkle a few sea salt flakes over the top if desired. Bake in the preheated oven for 25-30 minutes or until the top is golden brown and a toothpick inserted into the center comes out clean.
Cool and Serve: Once baked, remove the blondies from the oven and allow them to cool completely in the pan on a wire rack. Cut into squares or rectangles and serve.
