Preheat your oven to 350°F (175°C).

In a mixing bowl, beat the softened butter and granulated sugar together until light and fluffy.

In another bowl, whisk together the all-purpose flour, cornstarch, and salt.

Gradually add the dry mixture to the butter and sugar, mixing just until combined.

Turn the dough onto a lightly floured surface and roll it out to about 1/4 inch thick.

Use a cookie cutter to cut out shapes, or simply slice into rectangles.

Place the cookies on a baking sheet lined with parchment paper and bake for 15-20 minutes or until lightly golden.

Once baked, let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack.