Preheat oven to 350º. Line a 9x13 glass baking dish with parchment paper.
In a large bowl, combine melted butter, flour, powdered sugar, and salt. Slightly mix with a fork. Do not over mix. Gently press into the pan. Bake for 20 minutes or until the edges are lightly brown.
While the crust is baking, slightly beat eggs in another mixing bowl. Whisk in sugar and lemon juice until combined.
Pour lemon mixture into baked crust as soon as it comes out of the oven. Bake for 15 minutes.
Remove from oven, cover with foil, and bake another 15 minutes.
After the lemon bars are baked, dust with powdered sugar and let the bars cool completely on a wire rack. Garnish with lemon zest before serving if desired.
Notes
This is not a very "tart" and lemony recipe, so if you want more "zing" in your bite, be generous with the lemon zest garnish!