Turn our favorite green bean casserole into an easy set-it-and-forget-it kind of side.

Tender green beans are slow-cooked in creamy mushroom soup and topped with crispy fried onions.

Crockpot green bean casserole is a time-saving, space-saving side!

taking a spoonful of Crockpot Green Bean Casserole out of the pot

Crockpot Green Bean Casserole

  • Making a slow cooker green bean casserole frees up oven space and keeps warm for serving!
  • Perfect as a holiday side dish for Thanksgiving, Easter, or Christmas dinner but crockpot green bean casserole is also a Sunday supper side dish, too.
  • Easy-to-find, affordable ingredients make this delish dish a crowd-pleaser for gatherings and get-togethers!
mushroom soup , soy sauce , green beans , seasoning salt , milk , pepper , fried onions with labels to make Crockpot Green Bean Casserole

Ingredients for Slow Cooker Green Bean Casserole

GREEN BEANS: Use Frozen green beans or canned (and drained). If using fresh green beans, boil them for 4 minutes and the cool them in ice water.

SAUCE: Condensed cream of mushroom soup makes this dish super easy, but you could also use any ‘cream of soup’ like celery, potato, or chicken.

TOPPING: Crispy fried onions add a little salty crunch to this recipe, but you can also sprinkle on some seasoned bread crumbs or crushed pork rinds for a lower-carb dish.

VARIATIONS: We love an addition of cooked and crumbled bacon or a handful of shredded cheddar cheese for extra flavor!

How to Make Crockpot Green Bean Casserole

This recipe needs only five ready-made ingredients!

  1. Prepare green beans (as per the recipe below).
  2. Add the remaining ingredients reserving 1 cup of French fried onions.
  3. Cook through and top with remaining pan-fried French fried onions.
  4. Sprinkle French fried onions on green bean casserole before serving.

Make Ahead

Prep everything but the fried onions up to a day in advance and pop into the crockpot when ready to cook.

Storing Leftovers

Keep leftovers covered in the refrigerator for up to 4 days and reheat them on the stovetop or in the microwave.

Freezer Friendly? Absolutely! Simply keep it in a freezer-safe container for up to 2-3 months and thaw it from frozen overnight in the refrigerator. Reheat in the oven and top with extra French fried onions before serving.

Crockpot Green Bean Casserole on a spoon

Easy Slow Cooker Side Dishes

Did you make this Crock Pot Green Bean Casserole? Leave us a rating and a comment below!

cooked Crockpot Green Bean Casserole in the pot
5 from 18 votes↑ Click stars to rate now!
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Crockpot Green Bean Casserole

Healthy, colorful, and bursting with flavor, this crockpot green bean casserole is the perfect side dish for any occasion.
Prep Time 10 minutes
Cook Time 2 hours 30 minutes
Total Time 2 hours 40 minutes
Servings 8 cups
Author Holly Nilsson
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  • 8 cups frozen cut green beans thawed (2 lbs)
  • 21 ounces cream of mushroom soup (2 cans)
  • 1 cup milk
  • 2 teaspoons soy sauce
  • ¾ teaspoon black pepper
  • ¼ teaspoon seasoning salt or to taste
  • 3 cups crispy fried onions divided


  • Combine thawed green beans with soup, milk, soy sauce, pepper, seasoning salt, and 2 cups of crispy onions in a 6qt slow cooker.
  • Cook on low for 2 ½ to 3 hours or until beans are tender.
  • Once cooked through, turn the slow cooker to warm.
  • In a dry non-stick skillet, pan-fry the remaining crispy fried onions over medium heat, stirring frequently until lightly toasted.
  • Sprinkle fried onions on top just before serving.


In place of frozen beans, you can use 4 cans (14½ ounces each) of drained green beans.
Optional Additions:
  • 1 ½ cups shredded cheddar cheese (favorite!)
  • fried mushrooms, onions, garlic, and/or shallots
Store leftovers in an airtight container in the fridge for up to 
5 from 18 votes

Nutrition Information

Calories: 225 | Carbohydrates: 22g | Protein: 7g | Fat: 13g | Saturated Fat: 5g | Polyunsaturated Fat: 0.2g | Monounsaturated Fat: 1g | Cholesterol: 5mg | Sodium: 877mg | Potassium: 378mg | Fiber: 3g | Sugar: 5g | Vitamin A: 818IU | Vitamin C: 13mg | Calcium: 82mg | Iron: 2mg

Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.

Course Casserole, Side Dish, Slow Cooker
Cuisine American
Crockpot Green Bean Casserole with mushroom sauce and writing
cooked Crockpot Green Bean Casserole in the pot with writing
Crockpot Green Bean Casserole on a spoon with a title
Crockpot Green Bean Casserole in the pot and on a spoon with writing


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About the author

Holly is a wine and cheese lover, recipe creator, shopping enthusiast and self appointed foodie. Her greatest passion is creating in the kitchen and making deliciously comforting recipes for the everyday home cook!
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Recipe Rating


  1. Have always wanted a slow cooker recipe for this recipe. So glad I found yours! We don’t just
    make this for the holidays that’s how much we love this dish. Can’t wait to give it a try.5 stars

  2. Have had a similar recipe for a few years now. The only difference is that instead of the cream of mushroom, it used Classico Roasted Red Pepper Alfredo sauce. Unfortunately, Classico stopped making it, so it’s back to the cream of mushroom. Thanks for posting!5 stars

  3. Won’t fresh green beans cook in 3hours in the crockpot without the blanching ahead of time? Or does the blanching retain the green color better?

    1. I have only ever made this by blanching the green beans first so I can’t say for sure, Altie. If you decide to try it without blanching them, I would love to hear how it turns out!