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Crockpot Green Bean Casserole

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Indulge in a timeless classic with a modern twist: Crockpot Green Bean Casserole. This beloved dish, a staple at holiday gatherings and family dinners alike, gets a convenient makeover with the use of a slow cooker. Say goodbye to oven space struggles and hello to effortless cooking with this easy-to-follow recipe. With tender green beans, creamy mushroom sauce, and crispy fried onions, this casserole is sure to become a new favorite on your dinner table. In this article, we’ll guide you through the simple steps to create this comforting dish, complete with expert tips and tricks to ensure a perfect result every time. Let’s dive in and discover how to make Crockpot Green Bean Casserole a delicious addition to any meal!

In this recipe, we’re taking the classic green bean casserole and giving it a convenient twist by utilizing the slow cooker. Not only does this method save valuable oven space, but it also allows the flavors to meld together beautifully as the casserole cooks low and slow. Tender green beans are bathed in a rich and creamy mushroom sauce, infused with the savory essence of onions and garlic. Topped with crispy fried onions for that irresistible crunch, this dish is the epitome of comfort food perfection. Whether you’re preparing it for a holiday feast or a weeknight dinner, Crockpot Green Bean Casserole is sure to be a crowd-pleaser. So, let’s uncover the secrets to creating this timeless favorite with ease and efficiency!

slow cooker green bean

Crockpot Green Bean Casserole

Green bean casserole is a must make dish for the holidays and Sunday dinner! It is the perfect vegetable side dish that combines green beans with a creamy sauce and crunchy fried onions. Yum! The downfall is, especially on holidays, that this dish is taking up valuable oven space that you need for other dishes. That is why I love this Crockpot green bean casserole as well as the Instant Pot Green Bean casserole version!  

You will love being able to dump all your ingredients in your slow cooker and cook this classic dish. As an added bonus, it stays warm way longer in the crockpot! 

slow cooker green bean

How to make crockpot  green bean casserole

  • Prepare the slow cooker liner with nonstick cooking spray. 
  • Place all ingredients into the slow cooker EXCEPT about 1 cup of the french fried onions. Mix together until well combined. 
add all of the ingredients
  • Cover the slow cooker and cook on high for 5 to 6 hours. Top with remaining french fried onions prior to serving. 
crockpot Green Bean Casserole

Tips & Tricks

  1. Customize the Mushroom Sauce: Experiment with different variations of the mushroom sauce to suit your taste preferences. Add extra garlic, herbs like thyme or rosemary, or a splash of Worcestershire sauce for added depth of flavor.
  2. Add Cheese: For an extra layer of richness, consider adding shredded cheese to the casserole. Cheddar, Swiss, or Parmesan cheese all work well and can take the dish to the next level of deliciousness.
  3. Stir Occasionally: To ensure even cooking, give the casserole a gentle stir occasionally during the cooking process. This helps distribute the heat evenly and prevents any ingredients from sticking to the bottom of the slow cooker.
  4. Top with Crispy Onions: Add the crispy fried onions to the top of the casserole during the last 30 minutes of cooking. This ensures that they stay crunchy and don’t become soggy.
  5. Garnish Before Serving: Before serving, garnish the casserole with fresh herbs like parsley or chives for a pop of color and freshness.
  6. Serve Immediately: Once the casserole is done cooking, serve it immediately for the best taste and texture. Leftovers can be stored in the refrigerator and reheated later for another delicious meal.
Slow Cooker Green Bean Casserole


You will want to store your leftover green bean casserole in an airtight container for up to 4 days in the fridge. 


To reheat you can place the desired amount in a microwavable safe container and warm it to your desired temperature. 

You can also warm this back up in the oven at 350° for about 30 minutes. Feel free to sprinkle more french fried onions on top with a few minutes left to add a little crunch!

crockpot Green Bean Casserole

Can I brown the onions before adding them?

Yes, you can easily make your onions even more crispy. Cook them over medium-high heat on the stove for about 3 minutes or until browned. Sprinkle over your casserole. 

Slow Cooker Green Bean Casserole

Can I make this ahead of time?

Yes! You can easily mix everything ahead of time and cover and place in the fridge for up to 2 days. 

Crockpot green bean casserole

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crockpot Green Bean Casserole
slow cooker green bean

Crockpot Green Bean Casserole

Prep Time: 5 minutes
Cook Time: 5 hours
Total Time: 5 hours 5 minutes

Crockpot green bean casserole combines green beans, mushroom soup, milk, cheese, and french fried onion to create the classic holiday side dish right in your slow cooker. You will love this new way to create this classic dish everyone loves!


  • 3 (12 ounces) packages frozen cut green beans
  • 2 (10 ¾ ounce) cans condensed cream of mushroom soup
  • ⅔ cup milk
  • ½ cup grated Parmesan cheese
  • ¼ teaspoon salt
  • ¼ teaspoon black pepper
  • 1 (6 ounces) package french fried onions, divided


    1. Prepare the slow cooker liner with nonstick cooking spray. 
    2. Place all ingredients into the slow cooker EXCEPT about 1 cup of the french fried onions. Mix together until well combined. 
    3. Cover the slow cooker and cook on high for 5 to 6 hours. Top with remaining french fried onions prior to serving. 

Nutrition Information:



Serving Size:


Amount Per Serving: Calories: 114Total Fat: 6gSaturated Fat: 2gTrans Fat: 0gUnsaturated Fat: 4gCholesterol: 11mgSodium: 763mgCarbohydrates: 10gFiber: 1gSugar: 1gProtein: 5g

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