First, you need a small, powerful blender, like a spice grinder, Nutri bullet, Vitamix, or food processor. I had the best success in a blender. You might have to try a few different appliances to see what works best.

Add in the sugar and cornflour/cornstarch. The cornflour is important as it keeps the sugar dry.

Blend it all together until fine, around 4-5 minutes. Stop, and stir with a spatula to make sure it gets mixed all around so that it is all blended.

After a few minutes, run it through your fingers; if it feels gritty, then keep blending. You might still feel a little texture at the end, but that’s ok. If you can’t seem to get it really fine, you might need to try a smaller, stronger blender.

Store your Homemade Powdered sugar in an airtight container; it will keep indefinitely.