1In a large bowl combine butter, Cream cheese and vanilla and beat until completely incorporated and smooth. I like to use my stand mixer but any mixer will do. This can also be done by hand but be very vigorous and take the time to get the nice, light loftiness that makes this frosting great. Add sifted powdered sugar a cup or so at a time and beat vigorously until smooth. You don’t have to sift the sugar if it is powdery and not clumping. It is usually fine here in dry Colorado. I don’t use a whole lb. usually about ¾ of a pound, just add till consistency and taste are right,
It is best to refrigerate a bit. If it is too thick when it comes time to spread, add a little bit of milk.