If you’ve ever reached for the onion powder jar and found it empty, you know how essential this humble seasoning really is.
It adds instant savory depth to soups, sauces, marinades, and spice blends — and the best part?
You can make your own at home for just pennies, with no fillers or anti-caking agents.
Today I’ll show you two easy ways to make onion powder:
one that uses onion skins for a zero-waste kitchen win, and one that uses roasted onions for a rich, sweet flavor you can’t get from store-bought.
Method 1 — Onion Skin Powder (Zero-Waste Version)
Most of us toss onion skins into the compost bin — but they’re actually packed with flavor, nutrients, and a beautiful golden color.
Turning them into onion powder is a great way to use every part of the vegetable.
You’ll need:
- Clean, dry outer skins from yellow, white, or red onions
- A dehydrator or oven
- A spice grinder or blender
Step-by-step:
- Save & clean — Collect onion skins as you cook. Give them a quick rinse to remove dirt or debris, then pat completely dry.
- Dry thoroughly — Spread skins on dehydrator trays and dry at 125°F (52°C) until crisp.
Oven option: Place skins on a baking sheet and bake at the lowest setting with the door slightly open until brittle. - Grind to powder — Once fully dry, grind into a fine powder using a spice grinder.
- Store — Keep in an airtight jar away from light.
Flavor profile: Onion skin powder has a mellow, toasty onion flavor and works beautifully in broths, rubs, and as a natural food coloring for bread or pasta.
Method 2 — Roasted Onion Powder (Sweet & Savory Version)
This is the onion powder that will have you licking your fingers. Roasting draws out the onions’ natural sugars and adds a gentle caramel note.
You’ll need:
- Whole onions (yellow, white, or sweet varieties)
- A dehydrator or oven
- A spice grinder or blender
Step-by-step:
- Prep the onions — Peel and slice onions into thin, even rings or half-moons.
- Roast gently — Place slices on a parchment-lined baking sheet and roast at 250°F (120°C) for 30–40 minutes, until edges just start to turn golden. Don’t over-brown — you want sweet, not burnt.
- Dry completely — Transfer roasted slices to dehydrator trays and dry at 125°F (52°C) until brittle.
Oven option: Continue drying at lowest setting until crisp. - Grind to powder — Once cooled, grind into a fine powder.
- Store — Airtight jar, cool and dark place.
Flavor profile: Roasted onion powder is sweet, savory, and a little smoky — perfect for spice rubs, salad dressings, or adding depth to dips and spreads.
Tips for Both Methods:
- Always make sure onions or skins are completely dry before grinding — any moisture will cause clumping and shorten shelf life.
- Store in airtight jars away from heat and light for up to 12 months.
- For extra insurance against clumps, tuck a small cheesecloth pouch of uncooked rice into the jar.
Why make your own?
Homemade onion powder is fresher, more flavorful, and completely customizable — plus, it’s a great way to use up produce and reduce food waste.
Whether you’re going for the golden subtlety of onion skins or the bold sweetness of roasted onions, your pantry will thank you.