Instructions:
1. In a food processor or high powdered blender, add the granulated sugar and cornstarch.
2. Cover firmly with a lid and blend for 4-5 minutes on high power.
3. Carefully (and slowly) remove the lid from the blender. Use a spoon to push all of the ingredients to the bottom. Cover with a lid again and blend for an additional few minutes or until the sugar is powdery.