01 - Preheat oven to 350°F. Line a 9x9-inch baking pan with parchment paper, leaving overhang for easy removal.
02 - Beat butter and sugar until creamy. Add flour and salt, mixing until crumbly dough forms.
03 - Press dough evenly into pan bottom. Bake 18-20 minutes until edges are lightly golden.
04 - Whisk sugar, eggs, lemon juice, and lemon zest until smooth. Whisk in flour until fully combined.
05 - Gently fold raspberries into filling, being careful not to crush completely.
06 - Pour filling over hot crust immediately after removing from oven.
07 - Return to oven and bake 20-22 minutes until center is just set and no longer jiggles.
08 - Cool completely in pan on wire rack. Refrigerate at least 2 hours for easier slicing.
09 - Lift bars out using parchment overhang. Dust with powdered sugar before slicing into 16 bars. Garnish with extra raspberries if desired.