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4.50 from 8 votes

Oven Roasted Onions Recipe (Freezer-Friendly)

Do you have excess onions that you’d like to preserve? Then this is the recipe for you! In addition to making sweet, delicious homemade onion powder, freezing roasted onions is one of our favorite ways to preserve them. Take your onions up a notch with this scrumptious, roasted caramelized onion flavor!
Prep Time45 mins
Cook Time30 mins
Course: Preserved Food, Seasoning
Keyword: Freezing Onions, Preserved Onions, Roasted Onions


  • Oven
  • Roasting pan or baking sheets
  • Parchment Paper


  • Onions
  • Extra Virgin Olive Oil
  • Salt and Pepper


  • Preheat oven to 400 degrees Fahrenheit.
  • Wash and prepare the onions by removing the outer papery layer and slicing them widthwise to create ⅛ to ¼ inch rounds.
  • Place the onion rounds single layer on a baking sheet and drizzle with olive oil and a sprinkle of salt and pepper.
  • Roast the onions on 400 degrees F for 30 minutes or until lightly browned.
  • Once done, allow the onions and pan to cool. If you intend to freeze the onions for later use, place the cool pan of onion rounds in freezer (with the onions spread and not touching) for at least a couple hours or overnight.
  • Once frozen, stack the onion rounds into an airtight container and store in the freezer until use.