Whip the margarine, butter and icing sugar together well. You can use all butter for sure, then it is a shortbread for the purist. Once it looks all deliciously creamy, resist from eating it by the spoonful, and get your flour ready.
Start the mixer and slowly add in the flour, until it has all been added in. Then you can proceed to let your mixer do all the work for you and whip it for 6 minutes. You are wanting lighter than air shortbread here.
Using a small cookie scoop, scoop the dough out onto an ungreased baking sheet.
Top with sprinkles or a piece of Christmas cherry.
Bake them in a 275 degree oven for about 30-35 minutes; you want to dry out the shortbread in essence, not bake it, thus the low temperature. (If you have a warm kitchen or live in a warm climate, cool the cookies in the fridge then bake. They won't flatten out).
You can top this whipped shortbread with whatever sprinkles or cherries you prefer!