Slow Cooker Green Bean Casserole

Oct 13, 2020Updated Oct 17, 2024

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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 slow cooker mashed sweet potatoes and slow cooker stuffing).

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

How to make Green Bean Casserole in the Crock Pot:
How long do I cook?
How can I brown the French fried onions without an oven?
Can I use fresh or frozen green beans instead of canned?
What other green bean sides can I make in the slow cooker?
How long can I keep this on the warm setting after cooking?
More holiday side dishes we can’t live without:
Slow Cooker Green Bean Casserole Recipe

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.

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!

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?

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:

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

Slow Cooker Green Bean Casserole

4.77 from 17 votes

Prep Time: 10

Cook Time: 2 40

Total Time: 2 50

Servings:

By: Sarah Olson

Is any holiday meal complete without the classic Green Bean Casserole? Free up oven space by using your slow cooker.

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Equipment

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

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).

How to Video

Sarah’s 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.