Slow Cooker Caramelized Onions

Caramelized onions can take a sandwich to the next level, but you don’t always want to spend the time making caramelized onions just for a grilled cheese! I stumbled upon this fantastic idea to make caramelized onions in the slow cooker! It’s definitely one of those, “Why didn’t I think of that?” moments. Sure, it definitely takes longer but it’s so much easier and all the prep-work is done whenever you do want caramelized onions because you can freeze them too!

sliced onionsI actually cut my onions the night before, put them in a container which I then wrapped in plastic wrap and double bagged to keep the onion smell from permeating my entire refrigerator overnight. (No one wants to go to the office smelling like raw onion.) So in the morning all I had to do was dump my 3 lbs of onions into the crock pot with 3 tbsp of butter!

If you aren’t already hungry when you get home (I always am!), the smell of caramelized onions wafting over you as soon as you open the door will make you anxious to use them immediately! I used the onions for French Onion Soup – taking 30 minute off of my active cooking time. We also served them with burgers.

Slow Cooker Caramelized Onions


  • 3 lb yellow onions
  • 3 tbsp butter, cubed


  1. Using a sharp knife, slice onions thinly.
  2. Lightly spray inside of slow cooker with non stick cooking spray. Dump in onions and butter. Spritz top of onions with another hit of cooking spray.
  3. Cover and cook on high for 10 1/2 hours.

*This recipe is modified from Dorothy at*

Caramelized Onions

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