I hope I have chosen the right forum!! I am looking for a recipe for shortbread cookies. I had one a number of years ago that called for icing sugar, butter and cornstarch. I cannot find it and am hoping someone here might know it. Thanks and Merry Christmas 
Here’s one:
http://flylady.net/pages/FlyFocus3.asp
Exploding Biscuits
8oz butter
2oz icing sugar
6oz plain flour
2oz cornstarch
Cream all ingredients together with electric beater.
Refrigerate 30 minutes.
Roll into walnut sized balls and place well spread apart on a lightly greased baking tray.
Press down each one with a fork (dipped in hot water to stop it sticking to the mix).
Cook Gas Mark 4 (180 degrees C, 375 degrees F) for 20 minutes.
Leave to cool a few minutes on the baking sheet before moving to cooling rack to crisp up.