Preheat your oven to 350°F (175°C).
Line a 9x13-inch baking dish with parchment paper or lightly grease it.
In a bowl, mix 2 cups flour, 1/2 cup sugar, and 1/4 tsp salt.
Add 1 cup butter and use a pastry cutter until the mixture resembles fine crumbs.
Press this mixture into the prepared baking dish to form an even layer.
Bake the crust in the oven for 15 to 20 minutes until lightly golden.
Let it cool while you prepare the lemon filling.
For the filling, whisk together 1 1/2 cups sugar, 1/4 cup flour, and 4 eggs in a bowl until smooth.
Stir in 1/2 cup lemon juice and 2 tbsp lemon zest.
Pour the lemon mixture over the cooled crust.
Bake for 20 to 25 more minutes.
Once baked, let the bars cool, then refrigerate for at least two hours before slicing.