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How to Make Easy Homemade Onion Powder
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3.89 from 9 votes

Homemade from Scratch Onion Powder

Homemade onion powder is super easy to make and you know exactly what's in the jar!
Course: Pantry Staple
Author: Cery


  • onions
  • mandolin slicer or sharp knife and cutting board
  • dehydrator
  • blender or food processor


  • Peel the onions and cut off any really soft spots.
  • Slice the onions using the thinnest setting you have on your mandoline to make really thin slices. If you don't have a mandoline, cut the slices as thin as you can. The thinner the slices, the faster they dry.
  • Next spread the slices out on the dehydrator trays in a single layer.
  • Place in the dehydrator and set it to 145°F if you have a temperature control. If you do have a model with a thermostat, turn the temp down to 125°F after 2 hours.
  • Dry time will depend on how thick your slices are, how much moisture is in the onions, and the humidity level. Anywhere from 4 hours to overnight. But they just need to dry until they are leathery.
  • After they are dry, put them into your blender or food processor. Pulse until powdered.


You get approximately 1 1/2 Tbsp of onion powder from a medium onion.
I keep the bulk of it in a canning jar (surprise!) that I have sealed with my FoodSaver. And I have a spice jar full in the kitchen. Keep the onion powder stored in a cool, dry, dark place. This will store for a really long time under the right conditions.