Melt-in-Your-Mouth Shortbread

1 lb butter, softened
3 cups all-purpose flour
1 cup confectioners' sugar
1/2 cup cornstarch
1/4 teaspoon salt

Preheat oven to 375 degrees F.

Whip butter with an electric mixer until fluffy. Stir in the confectioners' sugar, cornstarch and flour. Beat on low for 1 minute, then on high for 3 to 4 minutes. Drop cookies by spoonfuls, 2 inches apart on an un-greased cookies sheet.Bake for 12 to 15 minutes, watching that the edges don't brown too much.

Cool on wire racks.