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The Magical Slow Cooker » Recipes » Side Dishes » Slow Cooker Green Bean Casserole

Slow Cooker Green Bean Casserole

by Sarah Olson on October 13, 2020 | Updated February 28, 2022 99 Comments

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collage of photos of green bean casserole with text overlay for pinterest

Slow Cooker Green Bean Casserole is a staple for Thanksgiving and Christmas. My recipe follows the classic recipe but made in the slow cooker.

My family can not go without the Green Bean Casserole. It’s pretty much the best side dish for Thanksgiving or Christmas (well, besides the mashed potatoes).

close up of green bean casserole with a spoon in it.

This recipe for Slow Cooker Green Bean Casserole makes a ton. When I make this for thanksgiving, it feeds about 15, with lots of leftovers. I think this recipe will serve up to 20 people.

canned green beans, cream of mushroom soup, french fried onions, milk in front of slow cooker.

How to make Green Bean Casserole in the Crock Pot:

My recipe is very close to the original green bean casserole recipe from Campbell’s but enough to feed a crowd. Though, I skip the soy sauce in my recipe.

  • Green beans – I use canned
  • Cream of mushroom soup – 3 cans in this recipe, this makes for a very saucy casserole
  • Milk – This helps thin out the soup
  • French Fried Onions – These are what make the dish. Be sure to see my tip on how to brown them.
  • Seasonings – Just pepper and onion powder. No salt needed, the green beans and cream of mushroom soup have PLENTY of salt added.
opened green beans, french fried onions, and cream of mushroom mixture on wooden table

How long do I cook?

  • Place the lid on the slow cooker.
  • Cook on HIGH for 2.5 hours without opening the lid during the cooking time.
3 photos of green bean casserole steps.

How can I brown the French fried onions without an oven?

  • Place the onions in a dry skillet set to medium-high heat on the stove-top.
  • Use a spoon and stir around the onions, for about 3 minutes or until browned.
  • Sprinkle over the green bean casserole and serve!
French fried onions in a skillet

Can I use fresh or frozen green beans instead of canned?

  • Use 10 cups fresh (trimmed and cut) or frozen green beans instead of canned.
  • Cook for 3.5 on high or until the green beans are tender.
finished cooking green bean casserole with wooden spoon in it

What other green bean sides can I make in the slow cooker?

  • Slow Cooker Cheesy Green Bean Casserole
  • Slow Cooker Green Beans and Bacon
  • Slow Cooker Green Beans and Potatoes
  • Slow Cooker Bacon Green Bean Casserole
close up image of green beans in sauce with French fried onions on top.

How long can I keep this on the warm setting after cooking?

  • You can keep this on the warm setting for 3 hours.
  • Though keep an eye on it and make sure the edges aren’t scorching, stir or turn off if the edges are getting too hot.

More holiday side dishes we can’t live without:

  • Slow Cooker Candied Yams
  • Slow Cooker Cranberry Sauce
  • Slow Cooker Mashed Sweet Potatoes
  • Slow Cooker Acorn Squash
  • Slow Cooker Butternut Squash
  • Slow Cooker Stuffing

Want to make more magic in your crockpot? Stay up to date and subscribe to my newsletter and follow along on Facebook, Instagram, Pinterest and YouTube.

green bean casserole in a slow cooker with wooden spoon in it.

Slow Cooker Green Bean Casserole

4.95 from 56 votes
Is any holiday meal complete without the classic Green Bean Casserole? Free up oven space by using your slow cooker.
Print Pin Rate
Course: Side Dish
Cuisine: American
Prep Time: 10 minutes
Cook Time: 2 hours 40 minutes
Total Time: 2 hours 50 minutes
Servings: 20
Calories: 201.71kcal
Author: Sarah Olson

Equipment Needed:

  • Slow Cooker- 6 quart or larger-oval

Ingredients:

  • 31.5 oz. cream of mushroom soup (three – 10.5 oz cans)
  • 1/2 cup milk
  • 1/8 tsp black pepper
  • 1/8 tsp onion powder
  • 145 oz. green beans (Ten – 14.5-oz cans; drained)
  • 12 oz. French's French Fried Onions (Two – 6-oz canisters)
  • non-stick cooking spray
US Customary – Metric

Instructions:

  • Spray the slow cooker with the non-stick cooking spray if desired.
  • Add the drained green beans to your slow cooker.
  • In a medium-size bowl, whisk the cream of mushrooms soup, milk, black pepper, and onion powder until smooth.
  • Pour the soup mixture over the beans. Add half (one canister) of the french friend onions. Stir gently.
  • Place the lid and cook on HIGH for 2½ hours.
  • Brown the remaining canister of French fried onions in a skillet on the stove top. Set the skillet to medium high heat, stir the onions around until brown (about 3 minutes).
  • Sprinkle the onions over and serve. (If you are traveling, you can brown your onions at home then add them to the slow cooker right before serving).
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How to Video:

Recipe Notes:

Can I use fresh (trimmed and cut) or frozen green beans?
  • Use 10 cups fresh (trimmed and cut) or frozen green beans instead of canned.
  • Cook for 3.5 hours on high or until the green beans are tender.
How long can I keep this on the warm setting after cooking?
You can keep this on the warm setting for 3 hours. Though keep an eye on it and make sure the edges aren’t scorching, stir or turn off if the edges are getting too hot.
Can I brown the onion on top of the casserole at the end of the cooking time (instead of using a skillet to brown them.)?
If your slow cooker is oven safe (check your manual), sprinkle the remaining canister of French fried onions to the top of the casserole.
  • Remove the slow cooker insert from the heating element and place it in the oven WITHOUT the lid.
  • Cook for 10 minutes at 350°F or until the onions are browned.
  • OR place the onions in a small dish in the oven for 10 minutes or until browned, then sprinkle over the casserole.
Can I halve this recipe?
Yes, you can cut this recipe in half. You will only need to cook for 2 hours on high before adding the remaining onions.
 

Nutrition Information:

Calories: 201.71kcal | Carbohydrates: 24.1g | Protein: 6.06g | Fat: 10.01g | Saturated Fat: 4.3g | Cholesterol: 2.9mg | Sodium: 480.77mg | Potassium: 499.33mg | Fiber: 5.64g | Sugar: 7.01g | Vitamin A: 1428.07IU | Vitamin C: 25.07mg | Calcium: 84.77mg | Iron: 2.44mg

Nutrition info is auto-generated. This information is an estimate; if you are on a special diet, please use your own calculations.

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    14848 shares
    • 2374

    Filed Under: Holidays, Side Dishes

    Comments

    1. John Kjelson says

      December 16, 2021 at 5:40 am

      Can this recipe be made ahead of time and frozen, minus the dried onion topping?

      Reply
      • Sarah Olson says

        December 16, 2021 at 9:19 am

        You could, though it may get mushy. Most of the ingredients (except the milk) are shelf stable, this may be one that I wouldn’t make ahead.

        Reply
    2. Anonymous says

      December 3, 2021 at 6:35 pm

      Do the frozen beans take longer then?

      Reply
    3. Jorge says

      November 24, 2021 at 7:52 pm

      I have a 5quart slow cooker, help! What should Adjust ?! Thanks

      Reply
      • Sarah Olson says

        November 24, 2021 at 9:08 pm

        It should fit in a 5 quart. Though I would mix it all in a large bowl first.

        Reply
    4. Genericmommy says

      November 24, 2021 at 2:08 pm

      Silly question, but when measuring the frozen green beans is it while still frozen or after heated up.

      Reply
      • Sarah Olson says

        November 24, 2021 at 5:33 pm

        While still frozen.

        Reply
    5. Anonymous says

      November 17, 2021 at 1:06 pm

      4 stars
      Hasn’t been my favorite green bean casserole recipe I’ve made, but all of my coworkers really liked it.
      I would definitely add cheese to this (mixed into the beans and soup mix).
      Very easy to throw together and bring to work for a carry-in, cleanup seems like it will be pretty simple too.

      Reply
    6. Tara says

      November 7, 2021 at 5:07 am

      If I were to do this on low how long would I do it for?

      Reply
      • Sarah Olson says

        November 7, 2021 at 12:12 pm

        I think low for 5 hours will work fine.

        Reply
        • Dina B. says

          November 25, 2021 at 3:02 am

          5 stars
          I just woke up thinkn Low & Slow can be best …and today it is. I am googling & searching and VOILÀ…youre recipe that i am using to scroll to the bottom of and find this ever so helpful tidbit‼️ Happy Thanksgiving

    7. Mona says

      October 10, 2021 at 10:34 am

      I omit the cream of mushroom so what other cream can use for beans?

      Reply
      • Sarah Olson says

        October 10, 2021 at 1:55 pm

        Hi! You will to make a sauce from scratch like this recipe: https://sallysbakingaddiction.com/creamy-green-bean-casserole-from-scratch/

        Reply
      • Katherine Urquhart says

        November 25, 2021 at 8:47 am

        I have a mushroom allergy so I always use cream of celery soup as a great substitute for cream of mushroom soup in all recipes and have done this plenty of times for this one. Nobody can tell…..

        Reply
        • Sarah Olson says

          November 25, 2021 at 9:20 am

          We have a mushroom allergy for one of our thanksgivings this year. I did the same, it was just as good!

    8. Christina says

      November 15, 2020 at 12:38 pm

      Wondering if anyone has used french-style canned green beans instead of traditional cut? When we make the regular oven casserole we always use french style and I am really hoping it translates to the crockpot.

      Reply
      • Sarah Olson says

        November 15, 2020 at 2:23 pm

        Yes, those work great.

        Reply
    9. Sydney R. says

      November 27, 2019 at 11:56 am

      Hello! If I half this recipe will it still take the same amount of time to cook?

      Reply
      • Sarah Olson says

        November 27, 2019 at 1:50 pm

        I think it will take about 2 hours on high.

        Reply
    10. Renee says

      November 26, 2019 at 5:50 pm

      Hello. Can I make this two Days prior and then reheat in oven? If so whats best way to do it.!?

      Renée

      Reply
      • Sarah Olson says

        November 26, 2019 at 7:34 pm

        There is no need to cook this twice, you could make it two days ahead of time and put in fridge. Then cook in slow cooker or in oven.

        Reply
        • Linda says

          November 24, 2020 at 11:49 am

          When reheating in oven after being in fridge for two days, how much time is needed to be ready to serve?

        • Sarah Olson says

          November 24, 2020 at 11:53 am

          Hi Linda. I have done this before. I would do 3.5 hours on high and gently stir once towards the end.

    11. Patricia says

      November 22, 2019 at 3:35 am

      How can I use frozen green beans?

      Reply
    12. Kaylynn says

      November 19, 2019 at 6:35 am

      I’m making this for a schools friendsgiving and planned on making this at home the night before. How would I go about with heating it up before we serve it?

      Reply
      • Sarah Olson says

        November 19, 2019 at 7:01 am

        Don’t cook it the night before (you can get it ready though and put in the fridge. Can you slow cook for the amount of time the recipe says before taking it in? (set an early alarm if needed).

        Reply
      • Lizzy says

        November 28, 2021 at 7:31 pm

        3 stars
        It wasn’t bad, but not how I wanted to to taste. Very bland, needs way more seasoning than listed above. Once I added my own, it tasted better.

        Reply
    13. Maggie says

      November 17, 2019 at 4:52 pm

      Can I use fresh string beans instead of canned?

      Reply
      • Sarah Olson says

        November 17, 2019 at 6:04 pm

        Yes!

        Reply
    14. Joann says

      November 17, 2019 at 8:28 am

      You state…..set the cooker on warm until ready to serve.
      When you serve, do you turn cooker off? Leave on warm? Do you leave casserole in the same heating element when you serve?

      Reply
      • Sarah Olson says

        November 17, 2019 at 9:15 am

        You can keep it on warm. Just keep an eye on it.

        Reply
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