Pre heat your oven to 325 degrees and line a cookie sheet with parchment paper.
In a large bowl, use an electric hand mixer to beat the butter and sugar until light and fluffy, scraping down the sides as needed.
Add in the flour and salt and stir until well combined and a dough forms.
Lightly flour your counter and roll the shortbread to about 1/2 inch thick. Cut into 18 squares
Transfer to the baking sheet (and offset spatula helps!) and bake until the edges are lightly golden brown, about 18-20 minutes. They set up a lot once cool.