How do you make frosting without butter?

Powdered (confectioner's) sugar is a basic ingredient to cream cheese frosting. Substitutions such as granulated table sugar, brown sugar or honey will not produce acceptable cream cheese frosting. In a pinch, it may be possible to process granulated white sugar in a blender or food processor until very fine. Then add a tablespoon of corn starch to each cup of very finely processed sugar to approximate powdered sugar.