01 - Preheat the oven to 350°F. Line a 9x9-inch baking pan with parchment paper, leaving an overhang for easy removal.
02 - In a medium bowl, beat together the butter and sugar until creamy. Add flour and salt, and mix until a crumbly dough forms.
03 - Press the dough evenly into the bottom of the prepared pan. Bake for 18–20 minutes, or until the edges are lightly golden.
04 - In a large bowl, whisk together sugar, eggs, lemon juice, and lemon zest until smooth. Whisk in the flour until fully combined.
05 - Gently fold in the raspberries, being careful not to crush them completely.
06 - Pour the filling over the hot crust as soon as it comes out of the oven. Return the pan to the oven and bake for 20–22 minutes, or until the center is just set and no longer jiggles.
07 - Cool completely in the pan on a wire rack. Once cool, refrigerate for at least 2 hours for easier slicing.
08 - Lift out of the pan using the parchment overhang. Dust with powdered sugar before slicing into bars. Garnish with extra raspberries if desired.