Powdered Sugar Substitute | How to Make Powdered Sugar
You can still make things like buttercream frosting without powdered cane sugar, just make this homemade unrefined powdered sugar!
Place the sweetener and either cornstarch or arrowroot into your blender or food processor. (I highly recommend the Vitamix!).
Blend on high continuously until the mixture is of uniform powdered consistency. In a high-powered blender like the Vitamix this will take only about 30 seconds.
Keep the lid on the blender until the powder settles (or you might have powdered-sugar coated cabinets, depending on how much of a powdered-sugar cloud gets kicked up by your blender!)
Store in a cool, dry place.