In a mixing bowl, with mixer on medium speed, cream the softened butter and Crisco until well blended.
Add the powdered sugar, vanilla, and milk. Beat mixture until light and fluffy; about 2-3 minutes. If icing appears a little too thick, add just a tad more milk; one teaspoon at a time. You do not want it too soft. You want a medium consistency.
Chocolate Buttercream Icing: add 2 Tablespoons of Cocoa with the powdered sugar.