Butter icing

I love, love, love buttercream icing. Some are better than others so I try all kinds. This one looks like a nice, simple chocolate buttercream that would be a good workhorse icing. Butter Icing 3/4 box powder sugar (2 cups) 1/2 cup coco 1/4 cup oleo 2 tablespoon milk salt 1 teas vanilla