Preheat oven to 350°F and line cookie sheets with parchment paper.
In a large bowl beat the butter with an electric mixer until very light and fluffy. Add the cornstarch and beat until well combined then add the icing sugar ½ cup at a time beating after each addition. Add the salt and flour 1 cup at a time until well incorporated and fluffy.
At this point you can add some chocolate chips to the dough if desired. They can be rolled into 1- inch balls or piped onto the cookie sheets creating a whirl design and then decorated with candied cherries or sprinkles to make then festive.