01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, leaving overhang for easy removal.
02 - Whisk melted butter and granulated sugar in a large bowl until smooth.
03 - Add eggs, vanilla extract, lemon zest, and lemon juice. Whisk until well combined.
04 - In a separate bowl, whisk together flour, baking powder, and salt.
05 - Gradually fold dry ingredients into wet mixture until just incorporated. Do not overmix.
06 - Gently fold in fresh raspberries, being careful not to crush them.
07 - Spread batter evenly into prepared pan and smooth the top.
08 - Bake for 28–32 minutes until edges are just golden and a toothpick inserted in center comes out with moist crumbs.
09 - Allow blondies to cool completely in the pan on a wire rack.
10 - Whisk together powdered sugar, lemon juice, and lemon zest until smooth and pourable.
11 - Drizzle glaze evenly over cooled blondies. Let set for at least 10 minutes, then cut into 16 squares.