Buttercream Recipe

"You can use a hand beater for this recipe Be sure to have your butter and shortening at room temperature before mixing (Heavy Cream can remain cold) I specify Domino Confectioners Sugar here- you can use any brand really- I just feel that the Domino 10X is the best and will not give a grittiness to the Buttercream like some other confectioner sugars do. So if you cannot get Domino brand, just sift it a couple times before adding it to the recipe, AND by the way, confectioner sugars can go "off" so be sure it is fresh. I also specify Sweetex HiRatio shortening here, and I know that is a difficult item to find as well. Crisco (and other solid vegetable shortenings) can tend to leave a greasy mouth feel. I have been told that this is another good brand..."