Preheat your oven to 350 degrees. Generously grease a 8x8 inch square cake pan and line it with parchment paper, leaving an overhang for easy removal.

In a medium bowl, beat together all of the ingredients for the crust at once. It will take several minutes for everything to come together. It should be thick, but spreadable. Spread the dough into a thin, even layer in your prepared pan, and bake it for 10-12 minutes, or until the crust becomes a light golden brown around the edges and on top.

While the crust bakes, in a medium bowl, whisk together the sugar, flour, and salt. In a small bowl, whisk together the eggs, lemon zest, and lemon juice. Pour the wet ingredients into the dry mixture, and whisk until smooth. It will be fairly thin.

Once the crust is baked, pour the filling on top. The crust should still be hot, just from the oven. Return the pan to the oven and bake for an additional 17-19 minutes, or until the filling looks set, and no longer looks liquid when you jiggle the pan lightly.

Cool the bars completely, and then chill before serving for at least one hour. Top with a dusting of powdered sugar if desired. Enjoy!