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Slow Cooker Green Bean Casserole

Free up oven space and make this Slow Cooker Green Bean Casserole instead! It uses premium frozen green beans and an easy homemade sauce with bacon and shallots for a delicious holiday side dish! You’ll be surprised just how easy it is to make! Overhead view of Slow Cooker Fresh Green Bean Casserole on a spoon over a white casserole dish.Anyone else share Thanksgiving as their favorite holiday? As a food blogger I nerd out a little over all of the delicious recipes and I look forward to sharing food with family and friends!

As much as I love it, I’ll also admit it can be stressful trying to get all the food cooked and the timing right. That’s why I now make a plan and I make good use of my casserole slow cooker!

This green bean casserole is perfect for making in a casserole or regular slow cooker and will free up oven space for you this holiday season.

overhead view of green beans in slow cooker casserole


About my green bean casserole:

For this version of a green bean casserole you will start out with browning up some delicious thick cut bacon!

Then you saute up some shallot and garlic until crispy and then using a little flour and broth you will a nice easy and delicious homemade sauce. Now, this is a holiday after all so let’s just add a nice cup of heavy cream as well!

Add the sauce to a bag of premium frozen thin cut green beans and top it all off with some fresh shredded Parmesan cheese. Amazing!!

The best part? This cooks PERFECTLY in the casserole slow cooker! Thanksgiving hacks for the win.

step by step collage making sauce for green bean casserole in skillet

How to make homemade sauce:

  • As I mentioned it starts with browning up some chopped up bacon
  • Then add garlic and shallots
  • Once those are tender, stir in some flour and make sure it coats the veggies well (this will thicken the sauce)
  • Slowly stir in chicken broth and let simmer until smooth and thickened
  • Add cream and seasonings and heat through

step by step collage making green bean casserole in slow cooker

How to cook this recipe in the slow cooker:

I prefer using my casserole slow cooker, but any 6 quart or larger slow cooker will do.

Add the frozen green beans, cover with sauce and cheese and cook for a few hours.

overhead view of slow cooker green bean casserole

In the last 15-30 minutes you’ll add your fried onions as a topper and let them toast up a bit with the lid back on.

I was very pleased with how well this “baked” in my slow cooker. Everything cooked evenly and the cheese melted perfectly over the top. I use my casserole slow cooker for so many things so make sure to check out this post for more ideas!

I’m curious, how many slow cookers will you be using to your holiday meal on the table? Leave me comment below the recipe and let me know!

Slow Cooker Green Bean Casserole on black plate and fork served

Slow Cooker Green Bean Casserole

Jennifer Draper
Why wait for the holidays to enjoy homemade green bean casserole? This recipe includes a delicious, made-from-scratch sauce with bacon and shallots over frozen green beans that cook to perfection in the slow cooker.
4.84 from 12 votes
Prep Time 25 minutes
Cook Time 3 hours
Total Time 3 hours 25 minutes
Course Side Dish
Cuisine American
Servings 12
Calories 251 kcal


  • Skillet
  • large slow cooker or casserole slow cooker


  • 24 oz frozen extra fine green beans
  • 2 slices thick-cut bacon chopped finely
  • 1 medium shallot minced about 1/4 cup
  • 2 cloves minced garlic I used jarred
  • 1/4 cup flour
  • 2 1/2 cups chicken broth
  • 1 cup heavy cream
  • 1/2 teaspoon salt
  • 1/4 teaspoon herb and garlic seasoning
  • 1 cup Parmesan cheese
  • 6 oz French fried onions


  • Spray slow cooker with nonstick cooking spray
  • Add frozen green beans to slow cooker
  • In skillet over medium-high heat, sauté bacon until lightly browned (around 3-5 minutes)
  • Add shallots and sauté for another 1-2 minutes until they just start to brown
  • Add minced garlic and cook for 1 more minute
  • Add flour evenly to pan, and stir the sauce to coat bacon, shallots, and garlic
  • Slowly add chicken broth while stirring until smooth
  • Let mixture simmer for about 4-6 minutes until sauce thickens enough to stick to a spoon
  • Add cream and seasonings and let mixture continue to simmer for another 3-4 minutes until it is thick and heated through
  • Pour sauce over green beans in slow cooker and toss lightly to evenly coat them
  • Sprinkle green beans with cheese, cover, and cook on high for 2 ½ to 3 hours or low for 5 to 6 hours
  • About 15 minutes before serving, sprinkle French-fried onions across top of casserole and let it heat on high until lightly crispy


  • Store leftovers in an airtight container in the fridge for up to 3-4 days. Reheat in a microwave-safe dish, stirring occasionally, or in a preheated oven at 350°F for about 15-20 minutes.
  • Use a standard casserole slow cooker or any 6-quart or larger slow cooker. This recipe will serve about 12 helpings.
  • Double (or halve) this recipe by adjusting the slow cooker size accordingly to prevent the mixture from being spread too thinly or too deep to heat properly.
  • To thicken the sauce a bit more, turn off the slow cooker and let it set for about 15 minutes before serving.
  • To make this recipe in the oven:
    • Prepare the sauce following the directions as written.
    • Preheat the oven to 350°F and allow the frozen green beans to thaw at room temperature.
    • Assemble the casserole as directed in an oven-safe dish and bake for about 30 minutes.
    • Add the French fried onions to the top of the casserole and bake for about 15 more minutes or until bubbly.


Calories: 251kcalCarbohydrates: 14gProtein: 7gFat: 19gSaturated Fat: 10gPolyunsaturated Fat: 1gMonounsaturated Fat: 4gTrans Fat: 0.01gCholesterol: 32mgSodium: 412mgPotassium: 213mgFiber: 2gSugar: 3gVitamin A: 752IUVitamin C: 7mgCalcium: 139mgIron: 1mg
Tried this recipe?Mention @slowcookergourmet or tag #slowcookergourmet!
Important nutritional disclaimer



  1. 5 stars
    Look delicious! I have this on the menu this week, but had a question; do you use grated parmesan cheese or fresh parmesan?

  2. 5 stars
    Hello, would it be ok to make the sauce the day before??? Then on Thanksgiving we can just combine with beans and cook in the 9 x 13 casserole slow cooker… Do you think 32oz bag green beans would fit in casserole slow cooker with the sauce changed 1 1/2 more??? Or should I use 32oz ‘cut’ green beans??? Thank You…

    1. I think you’ll be ok with the 32oz and maybe a little less than 1 1/2 times the sauce. I haven’t tried making it ahead, but I would think it would work. You may need to stir a few times as it heats up.

      1. Thank You Jennifer… We’ll be sure to let you know how the recipe turns out with 32oz green beans… We love love the 9×13 slow cooker casserole… Having are fun trying your recipes and our old casserole recipes in it…

  3. 4 stars
    Quick question… My family does not like change… When making the recipe with sauce from scratch, does it get as thick as with the canned soup??? If not do you think adding one can of the soup would help it to be as thick as canned soup version??? reply would like to ease the family into the new version… Thank You…

  4. 4 stars
    We made this for my hubby’s office potluck and he was very pleased with it — Green Bean casserole always having been one of his favorites!

  5. Do you have any suggestions for me before I triple this recipe ? I’m a little nervous with so much liquid . Thanks for any input !

  6. 5 stars
    You should taste the multiple dishes Lynn Heuer makes (she lives in Schaumburg, Illinois), she could win prizes! I miss Lynn, I moved to Virginia to be near my daughters. HAPPY THANKSGIVING EVERYONE!!!

4.84 from 12 votes (3 ratings without comment)

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