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    Home » Recipes » Sauces & Spices

    Slow Cooker Caramelized Onions

    UPDATED Oct 9, 2019 · PUBLISHED Oct 12, 2014 BY Marjory Pilley · This post may contain affiliate links. As an Amazon Associate I earn from qualifying purchases.

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    Graphic for Pinterest with top showing Slow Cooker Caramelized Onions in bowl and bottom showing onions in a crock-pot

    A splash of balsamic vinegar makes these Slow Cooker Caramelized Onions irresistibly good. You're going to need a stash for your freezer!

    Crock-Pot Caramelized Onions in a glass bowl

    I'm tearing up.

    My eyes aren't watering from all the onions I just sliced! I have tears of happiness because I have lots and lots and lots of caramelized onions stashed away in the freezer. And, I love caramelized onions. Using them in a dish is such an easy, healthy and delicious way to add richness and flavor. 🙂

    I recently posted a recipe for Pumpkin Pizza with Caramelized Onions and made caramelized onions the traditional way. Of course, they were delicious and a vital topping for the pizza. But, I usually don't have time to stand over the stove-top and keep vigil over the onions for the length of time required. The entire time I wistfully glanced over at my freezer and wished some caramelized onions stowed away.

    Easy Slow Cooker Caramelized Onions in a bowl

    It was time to pull out the crock-pot and restock.

    Tips for Making Slow Cooker Caramelized Onions

    For the most part, I make caramelized onions in the crock-pot like everyone else does. Slice the onions, toss them with olive oil and allow them to slow cook on low for 10 hours.

    The one thing I do just a bit differently than most...I stir in a splash of balsamic vinegar at 10 hours, place the lid ajar and allow some of the liquid to evaporate for the next hour. The balsamic vinegar enhances the color and taste. But, it doesn't overwhelm the onions at all.

    I also drain the onions before packaging them for storage. However, I don't throw away the precious juice. Instead, I freeze it and use it to flavor soups or dishes where broth might be appropriate.

    Ways to Use Slow Cooker Caramelized Onions

    On burgers...on sandwiches...on pizza...in soups...tossed with vegetables (like green beans)...in Sloppy Janes...or Pulled Pork, stirred into pasta, rice or other grains...or make Caramelized Onion Dip with Greek Yogurt.

    In any recipe that calls for caramelized onions!

    The list goes on and on and on. What would you do with a stash in your freezer?

    Please rate this recipe and tag @DinnerMom or #DinnerMom on social media. We love to see what you are cooking up!

    📋 Recipe

    Slow Cooker Caramelized Onions

    Slow Cooker Caramelized Onions

    Dress up your next recipe with Slow Cooker Caramelized Onions! It's an easy, healthy and delicious way to give a dish pizzazz.
    5 from 1 vote
    Print Pin Rate
    Course: Side Dish
    Cuisine: American
    Prep Time: 30 minutes minutes
    Cook Time: 11 hours hours
    Total Time: 11 hours hours 30 minutes minutes
    Servings: 12 Quarter cup servings
    Calories: 67kcal
    Author: Marjory Pilley

    Equipment

    • Slow Cooker - Programmable

    Ingredients

    • 3 pounds yellow onions
    • 2-3 Tablespoons olive oil
    • 1 Tablespoon balsamic vinegar

    Instructions

    • Uniformly slice onions with a mandolin or knife. I used setting 3 on a mandolin.
    • Place onions in slow cooker and drizzle with olive oil. Toss to coat all the onion slices.
    • Cover and cook on low for 10 hours.
    • Remove lid and stir in balsamic vinegar.
    • Return lid and leave ajar to allow liquid to begin evaporating.
    • Cook for 1 hour more on low.
    • Remove onions from slow cooker.
    • Place onions in a colander to drain off liquid. Liquid can be retained for another use.
    • Portion and freeze onions in a freezable containers or plastic bags according to needs. ¼ cup portion sizes work well.
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    Nutrition

    Calories: 67kcal | Carbohydrates: 10g | Protein: 1g | Fat: 2g | Sodium: 4mg | Potassium: 165mg | Fiber: 1g | Sugar: 5g | Vitamin C: 8.4mg | Calcium: 26mg | Iron: 0.2mg
    Nutritional and Food Safety Disclaimer

     

     

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      Recipe Rating




    1. Hezzi-D

      October 12, 2014 at 7:12 am

      Love that you can caramelize onions in the slow cooker! This would be perfect when making French Onion soup because the onions would be ready when I get home from work!

      Reply
    2. Renee

      October 12, 2014 at 7:37 am

      I'd have tears of joy too with knowing those yummy caramelized onions are in the freezer waiting to be used on so many things.

      Reply
    3. Lea Ann (Cooking On The Ranch)

      October 12, 2014 at 9:10 am

      Well, this just made caramelized onions a more frequent visitor to my meals. I love them and so many times don't have the 45 minutes it takes to fuss over them stovetop. Thanks so much for this recipe and love that splash of balsamic. Nice cooking with you for #SS

      Reply
    4. Tara

      October 12, 2014 at 2:18 pm

      This is brilliant!! What a great idea to have these at the ready in your freezer, I love caramelized onions. I have to do this for sure!! Love the added balsamic at the end!!

      Reply
    5. susan // the wimpy vegetarian

      October 12, 2014 at 3:58 pm

      I make caramelized onions all the time and can attest that adding balsamic vinegar is the way to go. It's amazing how their flavor transforms with it. But I've never made them in my slow cooker. FABULOUS idea.

      Reply
    6. The Ninja Baker

      October 12, 2014 at 4:12 pm

      Grrrreat idea to make a whole bunch of caramelized onions, freeze them and have them ready to go!

      Reply
    7. MealDiva

      October 12, 2014 at 9:50 pm

      Yum! Those are some great looking onions!

      Reply
    8. Betsy @ Desserts Required

      October 12, 2014 at 10:28 pm

      You are BRILLIANT! I never would have thought to caramelize onions in a crockpot. Not only is this a breeze to do but the ease of freezing the onions and then simply pulling them out when needed is fantastic!

      Reply
    9. [email protected] Tastes Good

      October 13, 2014 at 12:47 am

      I am learning so many wonderful slow cooker tips today! I LOVE caramelized onions! They make most everything better, but I never knew you could make them in the slow cooker! I don't use my slow cooker a whole lot, but you can be sure I will be making some caramelized onions in it, and I love your tip on adding the balsamic - yummm. Thanks, Marjory!

      Reply
    10. Beth @ The First Year

      October 13, 2014 at 7:58 am

      It's so nice to be able to get them all cooked at once, less tears in the end!

      Reply
    11. Heather // girlichef

      October 13, 2014 at 8:06 am

      I love the slow cooker caramelization method, I use it for garlic sometimes, too! It's so nice just to be able to let it happen all by itself and have a big batch ready to enjoy later. They look great, Marjory!

      Reply
    12. Rebecca @ Strength and Sunshine

      October 13, 2014 at 8:06 am

      Great! So easy and so many possibilities!

      Reply
    13. Jordan @ Smile Sandwich

      October 13, 2014 at 8:18 am

      I've always wanted to try caramelizing onions my slow cooker! Adding balsamic is such a good idea and so easy.

      Reply
    14. Martha @ A Family Feast

      October 13, 2014 at 8:47 am

      I'd like to eat some of those onions - just with a spoon! Those look seriously yummy! And never thought to make them in a slow cooker either - great idea!

      Reply
    15. Nutmeg Nanny

      October 13, 2014 at 8:58 am

      I love making caramelized onions but they get even better when made in the slow cooker. So easy!

      Reply
    16. Rebecca {foodie with family}

      October 13, 2014 at 9:17 am

      I love using my slow-cooker to make big batches of caramelized onions. It's so nice to have all those caramelized onions around: like money in the bank!

      Reply
    17. Marisa @ Uproot from Oregon

      October 13, 2014 at 9:52 am

      This sounds incredibly easy - and such an amazing end product! Yum!

      Reply
    18. Jeanette | Jeanette's Healthy Living

      October 13, 2014 at 10:20 am

      I'm definitely trying this - love the splash of balsamic vinegar you added.

      Reply
    19. christine

      October 13, 2014 at 10:37 am

      This is genius. I love this idea. Caramelizing onions for recipes adds so much time to my cooking, this is a great shortcut idea!

      Reply
    20. The Food Hunter

      October 13, 2014 at 11:03 am

      Love making caramelized onions for sandwich topping

      Reply
    21. Amy @Very Culinary

      October 13, 2014 at 11:36 am

      Caramelized onions are one of my absolute favorite foods. I could eat all 3 of those cups by myself. Dare me?

      Reply
    22. Aggie

      October 13, 2014 at 3:00 pm

      This is genius!! I have to try this method. Nothing like adding caramelized onions to pretty much anything 😉

      Reply
    23. Stephanie @ Back For Seconds

      October 13, 2014 at 3:26 pm

      I had no idea you could caramelize onions in a slow cooker! Awesome!

      Reply
    24. [email protected] Mom

      October 13, 2014 at 3:57 pm

      I use my slow cooker all the time but never have I just used it to carmelize onions, this is most certainly on my to do list for sure!

      Reply
    25. Ginny McMeans

      October 13, 2014 at 4:17 pm

      Excellent idea!!!! I will be doing this often. 🙂

      Reply
    26. Amee Livingston

      October 13, 2014 at 4:58 pm

      I'm so excited to try caramelized onions in my slow cooker! This is genius! Thanks for the great recipe!!

      Reply
    27. Paula - bell'alimento

      October 13, 2014 at 5:27 pm

      I like to keep a jar of these in my fridge to bump up the flavor in our weekly meals!

      Reply
    28. Cindys Recipes and Writings

      October 13, 2014 at 8:10 pm

      I want to put these onions on everything!

      Reply
    29. Sarah Walker Caron (Sarah's Cucina Bella)

      October 13, 2014 at 8:53 pm

      I had no idea that you could caramelize onions in the slow cooker! OMG - WOW!

      Reply
    30. Kirsten/ComfortablyDomestic

      October 13, 2014 at 10:18 pm

      Why have I never made caramelized onions in the crock pot?! I'm a fiend for caramelized onions...a FIEND! Having a stash in the freezer would be awesome.

      Reply
    31. Karissa | Sweet as a Cookie

      October 14, 2014 at 2:06 pm

      I'd be tearing up from cutting the onions and the happiness of caramelized onions in my freezer 🙂

      Reply
    32. Amanda @The Kitcheneer

      October 14, 2014 at 6:06 pm

      Great idea! I love that it's a slow cooker recipe and a freezer recipe all in one! Totally digging adding some onions on my pizza!

      Reply
    33. Kim Beaulieu

      October 14, 2014 at 7:34 pm

      This is one of my favourite things to make in my slow cooker. It's so good to put on top of sandwiches and whatnot. This makes me want to whip up a batch immediately.

      Reply
    34. Angela {Mind Over Batter}

      October 14, 2014 at 9:14 pm

      I will be crying tears of joy once I slow cook my onions to caramelized perfection! I never even considered doing this in my slow cooker! THANK YOU, THANK YOU, THANK YOU!!!

      Reply
    35. Sarah

      February 11, 2018 at 8:36 am

      5 stars
      We made this and used it all up on pizza so I'm off to make my next batch! Thanks for recipe.

      Reply

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