01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, leaving overhang for easy removal.
02 - Combine flour, sugar, and salt in a medium bowl. Cut in cold butter using a pastry blender or fork until mixture resembles coarse crumbs.
03 - Press mixture firmly into pan bottom. Bake for 15-18 minutes until lightly golden.
04 - Whisk together sugar, flour, and baking powder. Add eggs, lemon juice, and zest; whisk until smooth.
05 - Gently fold fresh raspberries into the lemon mixture.
06 - Pour filling over warm crust. Bake for 22-25 minutes until center is set and no longer jiggles.
07 - Cool completely in pan. Refrigerate for 1-2 hours before cutting for best results.
08 - Dust with powdered sugar before serving if desired.