Preheat your oven to 350°F (175°C).
Prepare a 9x13-inch baking pan by greasing it or lining with parchment paper.
In a mixing bowl, beat 1 cup of softened butter and 1/2 cup of granulated sugar until light and fluffy.
Add in 1 3/4 cups of flour and 1/4 teaspoon of salt, mixing until just combined.
Spread the crust mixture evenly into the prepared pan and press down firmly.
Bake the crust for 15-20 minutes, or until lightly golden.
While the crust bakes, prepare the lemon filling by whisking together 1 cup of sugar and 4 eggs until well combined.
Stir in 1 cup of fresh lemon juice and 2 tablespoons of lemon zest.
Pour the mixture over the baked crust and return to the oven for another 20-25 minutes.
Once set, remove from the oven and allow to cool at room temperature.
Dust with powdered sugar before slicing into squares for serving.