Christmas Cookie: Shortbread

This year I'm doing a TON of Christmas baking to give away as gifts. The first round of which is several batches of shortbread. This is my absolute favourite recipe for making shortbread. It's ridiculously easy to make and comes out perfect every time. So where did I get this recipe? Is it an old family recipe passed down from generation to generation?
Nope. It's from the back of the "Canada" brand corn starch box.

Shortbread

Makes about 24 cookies

1/2 cup corn starch
1/2 cup icing sugar
1 cup flour
3/4 cup butter (unsalted, room temperature)

Sift together the corn starch, icing sugar and flour.
With a wooden spoon, blend in butter until a soft smooth dough forms.
Chill dough 30 - 60 minutes.
Shape dough into 1" balls and place 1 1/2" apart on a cookie sheet.
Bake in 300 degree oven for 15-20 minutes, just until the edges start to change colour.
Transfer to a rack and cool.

Just shaping the dough into balls and then baking will give you a half sphere shaped cookie (I think they look like snowballs). You can also flatten the balls, or roll out the dough and cut it into shapes (or use cookie cutters). I have even shaped the dough into large squares and rounds about six" across and 1" thick, and marked them with a knife so that they can be cut into wedges and rectangles after baking (more like the traditional Scottish style).