01 - Preheat oven to 350°F. Line an 8x8-inch baking pan with parchment paper, allowing some overhang for easy removal later.
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 the crumb mixture firmly into the bottom of the prepared pan. Bake for 15-18 minutes until lightly golden.
04 - Whisk together sugar, flour, and baking powder. Add eggs, lemon juice, and lemon zest; whisk until completely smooth.
05 - Gently fold fresh raspberries into the lemon mixture, taking care not to crush them excessively.
06 - Pour the lemon raspberry filling over the warm crust. Return to oven and bake for 22-25 minutes until the center is set and no longer jiggles.
07 - Let cool completely in the pan. For cleanest cuts, refrigerate for 1-2 hours before slicing.
08 - Dust with powdered sugar before serving, if desired. Cut into 12 bars.