Slow Cooker Green Bean Casserole is a staple for Thanksgiving and Christmas, and this recipe follows the classic version, made in the slow cooker using cream of mushroom soup, green beans, French fried onions, milk, and black pepper.

To make Green Bean Casserole in your slow cooker or crockpot, simply layer the ingredients, set the temperature on high, and cook for 2½ hours. A quick toss of crispy onions just before serving adds the perfect crunch.

My family can’t go without the Green Bean Casserole—it’s essential at our Thanksgiving or Christmas table, right up there with Slow Cooker Cheesy Kielbasa Hashbrown Casserole and Slow Cooker Sausage and Baked Bean Casserole.

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Can I Use Fresh Green Beans Instead of Canned?

Absolutely, you can use fresh green beans in your Green Bean Casserole in Slow Cooker. Just blanch them first for about 5 minutes in boiling water, then drain well before adding them to the slow cooker. It’ll keep the texture nice and snappy.

Slow Cooker Green Bean Casserole Ingredients

• 3 cans of cream of mushroom soup (10.5 oz each or approximately 300 grams per can)
• 1/2 cup of milk (120 ml)
• 1/8 tsp of black pepper
• 1/8 tsp of onion powder
• 10 cans of green beans, drained (14.5 oz each or approximately 410 grams per can)
• 2 canisters of French’s French Fried Onions (6 oz each or approximately 170 grams per canister)
• Non-stick cooking spray

How To Make Slow Cooker Green Bean Casserole

1. Spray Your Slow Cooker: Start by spraying your slow cooker with non-stick cooking spray.
2. Add the Green Beans: Toss the drained green beans into your slow cooker.
3. Mix the Sauce: Grab a medium-sized bowl and whisk together the cream of mushroom soup, milk, black pepper, and onion powder until everything is smooth.
4. Combine Everything: Pour that creamy soup mixture over the green beans in the slow cooker. Now, add one canister of the French fried onions and give it a gentle stir.
5. Cook: Put the lid on and set your slow cooker on HIGH. Let it cook for 2½ hours.
6. Crisp Up Some Onions: When there’s about 10 minutes left on the timer, heat up a skillet over medium-high heat. Toss in the remaining canister of French fried onions and stir them around until they’re nicely browned, which should take about 3 minutes.
7. Serve It Up: Sprinkle those crispy onions over the top of the casserole. If you’re hitting the road, brown your onions at home and just throw them on top before you serve. Perfect for a potluck!

Can I Prepare Green Bean Casserole Ahead of Time?

Yes, you can assemble the Green Bean Casserole a day in advance and keep it in the fridge. Just hold off on adding the fried onions. When you’re ready to cook, pop it in the slow cooker and proceed as normal. Talk about a time-saver!

Recipe Tips

• Mix Things Up: If you want to ensure every bite is as flavorful as the last, give the casserole a good stir halfway through cooking.
• Keep It Crispy: For the freshest taste, add the French fried onions just before serving, not earlier; this way, they stay crunchy and delicious.
• Slow and Steady: Don’t rush the cooking by cranking up your slow cooker to high unless you’re short on time; cooking on low for a longer period can enhance the flavors.
• Taste Test: Always taste your casserole before serving it. Sometimes a pinch more of black pepper or a dash of salt can elevate the entire dish.

Recipe Variations

• Cheese Lover’s Dream: Add a cup of shredded cheddar cheese to the soup mixture for a cheesy twist that melts beautifully and adds a creamy texture.
• Bacon Bits Bonanza: Stir in some crispy bacon bits before serving for a smoky flavor that complements the green beans and fried onions perfectly.
• Mushroom Magic: If you’re a fan of mushrooms, toss in some sautéed mushrooms with the green beans for an extra earthy flavor that makes the dish even more hearty.
• Spice It Up: For those who like a little heat, sprinkle in some red pepper flakes or cayenne to the creamy soup mixture to give your casserole a spicy kick.

What To Serve With Green Bean Casserole

Serve your Green Bean Casserole with roasted turkey, mashed potatoes, cranberry sauce, Slow Cooker Lentil Cottage Pie, and cornbread stuffing.

You can also pair it with Steak and Guinness Pie and savory garlic bread for a complete meal experience.

How To Store Leftover Green Bean Casserole

In The Fridge:

Store the leftover Green Bean Casserole in an airtight container. It will keep well for up to 3 days. Ensure it’s cooled to room temperature before refrigerating to maintain quality.

In The Freezer:

This dish does not freeze well due to the creamy texture of the mushroom soup. Freezing can cause separation and a grainy texture when reheated.

How To Reheat Leftover Green Bean Casserole

Reheat your leftover Green Bean Casserole in a preheated oven at 350 degrees Fahrenheit. Cover it with aluminum foil and heat it for about 20 minutes, or until it’s hot throughout.

Alternatively, you can microwave it on high for 3 to 4 minutes, stirring halfway through for even heating.

Check out More Slow Cooker Recipes:

• Cracker Barrel Hashbrown Casserole Slow Cooker
• Slow Cooker Biscuit Breakfast Casserole
• Slow Cooker Chile Rellenos Casserole