01 - Preheat oven to 350°F. Line 8x8-inch baking pan with parchment paper, allowing overhang for easy removal.
02 - Whisk melted butter and granulated sugar in large bowl until smooth and fully incorporated.
03 - Beat in eggs, vanilla extract, lemon zest, and lemon juice until mixture is uniform.
04 - Whisk together flour, baking powder, and salt in separate bowl.
05 - Gradually fold dry ingredients into wet mixture until just combined. Avoid overmixing.
06 - Gently fold in fresh raspberries, taking care to minimize crushing.
07 - Transfer batter to prepared pan, spreading evenly and smoothing top surface.
08 - Bake 28-32 minutes until edges are lightly golden and toothpick inserted in center shows moist crumbs. Do not overbake.
09 - Let blondies cool completely in pan on wire rack before glazing.
10 - Whisk together powdered sugar, lemon juice, and lemon zest until smooth and pourable consistency.
11 - Drizzle glaze evenly over cooled blondies. Allow to set at least 10 minutes, then cut into 16 squares.