Caramelized Onions - Oven Baked - Great for OAMC

Total Time
Prep 15 mins
Cook 45 mins

I love caramelized onions but being a busy cook, I often end up with burnt onions if I'm distracted. My mother taught me this oven method and it's just the thing when I'm preparing my OAMC and need onions. I usually throw 1/4 - 1/2 cup in the zip lock bag when assembling anything that calls for ONIONS! Another nice thing about using the oven for these is how much can be prepared at one time. I chop my onions into big 1" pieces if using for soups, stews, or roasted meats. If using in a dish that will be frozen, cool the mixture before adding to other ingredients. You can also add a little cayenne pepper before baking if you want to spice them up. And if you're making burgers for the family, slicing them into 1/2" rings (and separating)before baking looks pretty cool.

Ingredients Nutrition


  1. Preheat oven to 500°F.
  2. Spread a large sheet of foil on top of a baking sheet leaving enough to pull around the onions (and seal) once they're baked.
  3. Roughly chop and place the onions in a large bowl. Toss with just enough of the oil to lightly coat. Salt and pepper to taste. You can also use a little cayenne or red pepper flakes if you like the spice.
  4. Put prepared onions on the foil covered tray and spread out as much as possible.
  5. Bake 30 - 40 minutes Do not let onions burn.
  6. Remove from oven and carefully seal the onions in the foil they were baked on.
  7. Set foil packet aside for 5-10 minutes so onions can finish steaming.
  8. If preparing to use as a sauce or condiment, substitute melted butter for the olive oil. I don't use butter if I'm making these to use in my freezer meals.


Most Helpful

These onions are so good. Used them on toasted sandwiches and they were delicious. My oven seems to bake a little hotter than most recipes, so I didn't bake these a full 30 minutes (probably more like 20 minutes) and I added extra olive oil to keep them really moist. I put some in the freezer to see if I can thaw and use later also with good results. Loved the technique and I will definitely make these again. Thanks for the great recipe! Update: These onions froze well and I have used them for many dishes. Fabulous!

Milkman's Daughter April 01, 2012

I roasted the 2 finely chopped onions (about 1/2 inch by 1/3 inch pieces) in 3 tablespoons of oil for 20 minutes. Then, stirred the caramelized onions around the pan's edges to the center and the rawer onions in the center to the edges and roasted for 20 more minutes. They turned out deep golden brown, sweet, and tender. Recommend using sweet onions like Vidalia for this because the higher sugar content caramelizes and develops a richer flavor than a regular yellow or white onion. Instead of freezing them, I served the caramelized onions right way on hamburgers for lunch. Thank you, Aunt Judy for a wonderfully delicious and easy recipe!

Garden Gate Kate August 13, 2013

Didn't work for me at all. Onions burned and were carbon, not caramelized .

Baht H. July 12, 2014

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