01 - Preheat the oven to 350°F. Line a 9x9-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - Melt the butter in a medium saucepan over medium heat. Continue cooking, stirring constantly, until the butter foams and turns golden brown with a nutty aroma, about 4-5 minutes. Immediately pour into a large mixing bowl to prevent burning. Let cool for 5 minutes.
03 - Whisk the brown sugar and granulated sugar into the cooled brown butter until well combined.
04 - Add the eggs and vanilla extract, whisking until smooth and glossy.
05 - Sift in the flour, baking powder, and salt. Fold gently with a spatula until just combined—do not overmix.
06 - Spread the batter evenly into the prepared pan.
07 - Warm the Biscoff cookie butter in the microwave for 15-20 seconds until easily pourable. Drizzle dollops over the blondie batter, then use a knife or skewer to gently swirl it through the top.
08 - Sprinkle the chopped Biscoff cookies evenly over the surface.
09 - Bake for 22-26 minutes, until the edges are golden and the center is just set—a toothpick should come out with moist crumbs.
10 - Cool completely in the pan before lifting out and slicing into squares.