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Slow Cooker Caramelized Onions

The easiest way to make caramelized onions is here!!! 

Just pop the slices in the slow cooker and let the magic happen while you're at work with out any fear of burning.  The only thing you need to do for this recipe is plan ahead.  

Get more tips on making your own caramelized onions plus 2 more ways to make them faster and easier. 

  • Duration
  • Cook Time
  • Prep Time
  • 1 cupServings


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


  1. Toss the onions with salt and evoo until well coated.
  2. Cook in slow cooker on low for 10 hours. The onions are ready at this point, but there will likely be a lot of liquid. Use the liquid for soups or stews or remove the lid and cook for another 4 hours until all the liquid evaporates. 

Store the caramelized onions in an airtight container in the fridge for about 2 weeks or in the freezer for 3 months.