- granulated sugar (any kind–white sugar, cane sugar, sucanat, coconut sugar–whatever floats your boat!)
- a blender
- Pour sugar into the blender.
- Start the blender.
- Watch your granulated sugar turn into sand (a.k.a. powdered sugar).
Now, I do have a high-powered blender, but I promise you it does not matter what type of blender you use.