Preheat your oven to 350°F (175°C).

In a large mixing bowl, combine the softened unsalted butter and powdered sugar. Cream until light and fluffy, about 2-3 minutes.

Gradually sift in the all-purpose flour and salt while continuing to mix until well combined (avoid over-mixing).

Pour in the vanilla extract and mix until fully incorporated.

Pat the dough into a 1/2-inch thick rectangle on a lightly floured surface and cut into squares or triangles.

Place the shaped cookies onto a baking sheet lined with parchment paper.

Bake for 15-18 minutes, or until the edges start turning a light golden brown.

Allow to cool on the baking sheet for 5 minutes, then transfer to a wire rack to cool completely.