Skip to main content

Oven Roasted Caramelized Onions

Caramelized onions are good on almost anything and they should be a regular ingredient in your home.  This oven method for caramelizing onions takes away all the time standing at the stove worrying if your onions are going to burn and the result is pure sweet delicious onions. 

Make the whole recipe, the onions shrink a lot and save the extras to top all your sandwiches and other meals, they stay good for 2 weeks in the fridge or freeze them for 3 months. 

For 2 more methods for making caramelized onions in your slow cooker or your instant pot click here

  • Duration
  • Cook Time
  • Prep Time
  • 2 cupsServings


  • 3 large Spanish Onions, thinly sliced
  • 2 teaspoons kosher salt
  • ¼ cup extra virgin olive oil, such as Colavita


1. Preheat oven to 400°F.

2. Place onions, evoo, and salt into a 9- x13- baking dish. Roast, covered for 1 hour and then uncover and roast for an additional 15 minutes. 

You will know when they are done because they will be soft, sweet and delicious.