Preheat your oven to 325°F (163°C).
Beat the butter and powdered sugar together until the mixture becomes smooth, pale, and fluffy.
Add vanilla extract and salt, mixing thoroughly.
Gradually add flour, mixing until a crumbly dough forms.
Shape the dough: Press it into a square baking pan lined with parchment paper, about ½-inch thick.
Refrigerate the dough for 20 to 30 minutes to firm it up and reduce spreading during baking.
Bake for 20-25 minutes or until the edges turn a light golden brown.
Cool completely before cutting into rectangular or square pieces.
