Preheat your oven to 350°F.
Line a 9x13-inch baking dish with parchment paper or foil.
Leave an overhang on all sides.
In a bowl, mix the flour, confectioners' sugar, and melted butter until combined.
Press the mixture evenly into the prepared baking dish to form the crust.
Bake for about 20 minutes, or until lightly golden.
While the crust is baking, whisk the eggs, granulated sugar, lemon juice, lemon zest, flour, and salt in another bowl.
Ensure the mixture is smooth and well combined.
Pour the lemon mixture over the warm crust.
Spread it evenly with a spatula to cover the entire surface.
Return the dish to the oven and bake for an additional 20-25 minutes.
The top should be set, but make sure it does not brown too much.
Let it cool completely before slicing into bars.