1 pound unsalted butter, softened
1 cup sifted icing sugar
3 cups all-purpose flour
1/2 cup cornstarch
1/2 teaspoon coarse salt
In bowl of electric mixer, beat butter with icing sugar, until light and fluffy. In another bowl, combine our, cornstarch and salt. Mix our mixture into butter until just combined. Chill dough 30 minutes.
Preheat oven to 350°F. Roll 1 tablespoon at a time into small balls. Place on parchment lined baking sheet. With fork dipped in our, press down to flatten. Bake for 8 to 10 minutes or until pale golden. Let cool completely before storing.