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Onion powder in a small bowl.

Homemade Onion Powder

Make homemade onion powder easily with a dehydrator or oven. Homemade always tastes better, and the cost savings is significant! Learn how to preserve onions by making dried onion powder with this tutorial.
4 from 10 votes
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Course: Condiment
Cuisine: American
Prep Time: 15 minutes
Dehydrating Time: 6 hours
Total Time: 6 hours 15 minutes
Servings: 1 cup
Calories: 60kcal
Author: Carolyn Thomas


  • Dehydrator or Oven


  • 1 large onion


  • Remove the loose peels of each onion, cut off both ends and slice in half. Remove any remaining peel off the onion (save skins and peels for broth!).
  • Slice onions in skinny uniform slices.
  • Line dehydrator trays with onion slices in a single layer, it's ok if they overlap a bit.
  • Dehydrate onion slices for 6-8 hours at 150 degrees F or until all onion pieces snap easily and are completely dry.
  • Grind dried onion slices in a high-powered blender, food processor or spice grinder until a fine powder.
  • Store in an air-tight container.



  • If using the oven, see instructions in the post above.
  • Try to slice onions uniformly so they all dry at the same speed.
  • When checking if onions are dry, be sure to check the largest pieces, and check multiple pieces to ensure all onions are completely dry. 
  • You don't want to proceed until onions are completely dry as this could spoil your onion powder.
  • Store onion powder in an air-tight jar or spice container.


Calories: 60kcal | Carbohydrates: 14g | Protein: 2g | Fat: 1g | Saturated Fat: 1g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 1g | Sodium: 6mg | Potassium: 219mg | Fiber: 3g | Sugar: 6g | Vitamin A: 3IU | Vitamin C: 11mg | Calcium: 35mg | Iron: 1mg
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