Onions were on sale here last week. I hate passing up on a deal, so bought a few nice big onions, and proceeded to make homemade onion powder using my Nesco Snackmaster Pro.
Onionssliced or chopped thin (try to make the pieces consistent in size)
Instructions
Place the onions into the dehydrator. Make sure they do not touch or overlap.
Dry at 165 F for 18-24 hours, or until the onions are crispy. Smaller pieces will take less time. I cut mine big, so they took the full 24 hours.
Let cool completely then grind using a blender or blade coffee grinder (not a burr grinder).
Notes
Keep in an air-right container. I place mine in a Mason jar, cover it, then use a vacuum-sealer attachment specifically for jars to remove all of the air.