Step 1 - Harvest the tops. Grow your own onions or harvest the tops from a friend with a garden.
Step 2 - Dry the tops. You can cut them up slightly or leave them whole it is your choice, depending on how you are drying them. I used a dehydrator but you can use a solar dryer, or an oven.
Step 3 - Grind them into powder. I have small spice grinder but you can do it by hand or use a food processor, whatever works for you.
Step 4 - Store in a dry airtight container out of direct sun.
This powder is more green since it is from the tops rather than the onion itself. Great way not to waste anything grown and the taste is wonderful add just like onion powder to give an onion taste to your recipes. Enjoy!