01 -
Preheat oven to 325°F (165°C). Line a small baking dish (about 6x6 inches) with parchment paper, leaving some overhang for easy removal.
02 -
In a medium bowl, mix flour, powdered sugar, and salt. Add the cold cubed butter and cut it in using a pastry cutter or fork until the mixture resembles coarse crumbs. Press the mixture firmly and evenly into the bottom of the prepared pan.
03 -
Bake the crust in the preheated oven for 18-20 minutes until lightly golden around the edges.
04 -
While the crust bakes, make the filling. In a bowl, whisk together the granulated sugar, egg, lemon juice, lemon zest, flour, and salt until smooth and well combined.
05 -
When the crust is done, pour the filling mixture over the hot crust (no need to let it cool). Return to the oven and bake for an additional 18-20 minutes, or until the filling is set and no longer jiggles in the center.
06 -
Allow the bars to cool completely in the pan on a wire rack. Once cooled, lift out using the parchment paper overhang, dust the top with additional powdered sugar, and cut into squares.