Slow Cooker Green Bean Casserole is the easiest way to make everyones favorite Thanksgiving side dish!  Make using fresh or canned green beans!

slow cooker green bean casserole

I originally posted this recipe back in November 2016, the recipe stays the same, we’ve added some updated instructions and new photos!  It’s definitely safe to say that green bean casserole is my favorite side dish at Thanksgiving and Christmas. This is more of a classic, using canned green beans and soup.  If you’re here looking for a homemade version, be sure to try our baked Green Bean Casserole from scratch!

Slow Cooker Green Bean Casserole:

This recipe works out perfectly with fresh, or canned green beans and I’ve given directions for both in the recipe card.  You can also use frozen if you want, but, you’ll have best results if you thaw them first.  Throwing them in frozen seems to make the casserole watery.  What I love so much about this is that I can mix everything up right in the slow cooker, put on the lid, and then just top with extra french fried onions about 30 minutes before serving.

green bean casserole in slow cooker

Recipe Tips:

  • Plan ahead!  This recipe takes 2 hours on low in the crockpot, plus another 30 minutes after you top with the french onions.
  • You can make this in advance.  Simply mix everything together in a large mixing bowl, cover with plastic wrap and refrigerate for up to 3 days.
  • If you absolutely hate cream of mushroom soup, then cream of chicken or even cheddar cheese soup work great here as well.
  • The cheese is optional!  We love the cheddar and parmesan, but you can leave them out if that’s your preference, or sub in your favorite kind of cheese.

photo of green bean casserole made in slow cooker


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5 from 46 votes

Slow Cooker Green Bean Casserole

Slow Cooker Green Bean Casserole is the easiest way to make everyones favorite Thanksgiving side dish!  Make using fresh or canned green beans!
Prep 10 minutes
Cook 3 hours
Total 3 hours 10 minutes
Servings 10



  • In your crockpot combine the cream of mushroom soup, sour cream, milk, and seasonings, and whisk to combine.  
  • Stir in the green beans, cheddar, parmesan, and half of the french fried onions.  Place the lid on your crockpot and cook on low for 2 hours.
  • After two hours stir the casserole well and add the remaining french fried onions to the top.  Replace the lid and continue cooking for 30 minutes, up to one more hour.  


NOTE: The cheese in this recipe is optional, you can leave it out if desired without making any other adjustments.
MAKE AHEAD:  This casserole can be mixed up in a large bowl, covered, and stored in the refrigerator for up to 3 days before cooking.
NOTE:  After cooking this casserole can be left in the crockpot on warm for up to 2 hours.
NOTE ON GREEN BEANS:  If you are using fresh or frozen green beans instead of canned I recommend using a total of 24 ounces or 1.5 pounds total. If using frozen green beans, thaw them first.


Serving: 1.5Cup, Calories: 150kcal

Nutrition information is automatically calculated, so should only be used as an approximation.

Additional Info

Course: Side Dish
Cuisine: American
Like this? Rate & review this recipe below!





Hey! Nice to meet you! I'm Nichole!

Welcome to The Salty Marshmallow! I'm a mom, animal lover, photographer, & kitchen mess-maker. Here you will find the result of my decades-long passion for chasing the best flavors in the kitchen, all meant to be cooked by regular people with busy lives just like you and me.

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  1. 5 stars
    Made this for the first time wanted to try something different this Christmas dinner it was all gone every one like it I was told to make this again.

  2. 5 stars
    Very Good ! It was creamy. I was going to crumble bacon on top but I forgot. I also think i’ll saute some ontons and add them. It was very much liked . I will make it again. 🙂

  3. 5 stars
    The best EVER green bean casserole. The additional goodies in this recipe (sour cream, garlic powder, grated cheddar and parmesan cheeses) take Green Bean Casserole to a new level of delicious. The addition of new flavors make a richer and more intense taste experience but still holds fond memories of the original dish. My family loves it, and we’ve adopted it as a must-have for our Thanksgiving menu. NOTE: It is good for the whole year, holiday not required…LOL! Oh, and did I mention It is so simple to make it in the crock pot.

  4. 5 stars
    I found this recipe years ago and I want to thank you. It’s easy and delicious to make. Every thanksgiving this is my go-to recipe.

    1. I strongly recommend pre-cooking fresh green beans. I made the casserole this past Thanksgiving but, unlike previous years, I decided to use fresh green beans. I did not pre-cook them and after the two and a half hours in the slow cooker, they were crunchy as all get out and did not seem to have cooked at all. The casserole was ruined. So pre-cook, although I plan to stick with canned from now on.

  5. 5 stars
    A little late with my review, but I made this recipe for Thanksgiving last year and it was a hit. My daughter and son-in-law far preferred it to the green bean casseroles I’ve made in the past. In fact, my son-in-law, who has never cared for green bean casserole because he doesn’t like mushrooms, (and no, I did not substitute cream of chicken soup or cheddar cheese soup because he doesn’t like mushrooms, I stick to recipes to the letter, eat what I make or don’t eat) had seconds and ate some of the leftovers. I will make it every Thanksgiving from now on.

  6. 5 stars
    Dear “Salty”,
    Your recipe I’m sure will be a winner at our family Christmas gathering which was postponed a week due to snow and icy roads!
    Green Bean Casserole is our son’s favorite holiday hotdish.
    The recipe says crockpot but I only have a slow cooker. Does it matter?
    Karen in Tacoma, WA

  7. 5 stars
    This recipe is fantastic. About ten years ago found a crockpot green bean casserole using Classico Roasted Red pepper Alfredo Sauce instead of the cream of mushroom. It was amazing. Only way we made it, until three years ago, could no longer find the sauce. It is still listed on Classico’s website, but no store near any of my relatives carries it. This one is now the top of the list, and an annual-if not more often- side in our home during the holidays.