Preheat your oven to 350°F (175°C) and line a 13x9 inch baking pan with parchment paper.

Cream together the softened unsalted butter and granulated sugar until light and fluffy. Blend in vanilla extract, then gradually add flour and salt. Press mixture into the pan and bake for 18-20 minutes until golden brown.

In a mixing bowl, whisk together the large eggs and sugar, then mix in lemon juice, lemon zest, and flour until smooth.

Once the crust is done, pour the lemon filling over it and bake for 30-35 minutes until set.

Let the bars cool for at least 1 hour, then refrigerate for 2 hours before slicing and dusting with confectioners sugar.