Slow Cooker Green Bean Casserole


Slow Cooker Green Bean Casserole

Get loads of flavor in this green bean casserole by using fresh green beans.

Slow Cooker Green Bean Casserole
Slow Cooker Green Bean Casserole

When you’re cooking up a storm, it can be a relief to let the slow cooker handle one of your favorite dishes. That’s what you can do with this slow cooker green bean casserole, which is as delicious as it is easy to make. This green bean casserole recipe uses fresh green beans, so you get plenty of flavor and a great texture. Plus, it features a homemade mushroom cream sauce, making this family classic into a dish that’s elegant enough for any occasion. Who says green bean casserole is just for the holidays?

From the Chef: "I haven't always been a big fan of green beans, but as long as I can dress them up with ingredients like mushrooms and crunchy French fried onions, I'm first in line. French fried onions became a pantry staple in the 1950s, and the green bean casserole became the ideal vehicle to let it shine."
- Addie Gundry

This recipe is from RecipeLion's 103 Cookbook series, Retro Recipes from the ‘50s and ‘60s: 103 Vintage Appetizers, Dinners, and Drinks Everyone Will Love.

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Preparation Time10 min

Slow Cooker Time LOW4 hr


  • 1 pound fresh green beans, cut into 2-inch pieces
  • 5 tablespoons unsalted butter
  • 3 tablespoons all-purpose flour
  • 1/2 cup chicken broth
  • 1/2 cup whole milk
  • 1/4 cup half-and-half (or an additional 1/4 cup whole milk)
  • 6 ounces cremini mushrooms, stemmed and sliced
  • 1/2 teaspoon kosher salt
  • 1/4 teaspoon freshly ground black pepper
  • 1/2 cup finely grated Parmesan cheese
  • 1 (2.8-ounce) container French fried onions
  • 1/2 cup panko bread crumbs


  1. Coat the insert of a 6-quart slow cooker with cooking spray.

  2. Put the green beans in the slow cooker.

  3. In a small saucepan, melt 3 tablespoons of the butter over medium heat. Add the flour and whisk until the flour has been absorbed and the mixture turns light yellow with large dry bubbles. Add the broth, milk, and half-and-half and cook, whisking, until the sauce is thick and coats the back of a spoon, about 3 minutes.

  4. In a medium skillet, melt 1 tablespoon of the butter over medium-high heat. Add the mushrooms and the salt and pepper and cook, stirring frequently, until they have exuded their liquids and begin to brown, 3 to 5 minutes. Remove from the heat.

  5. Stir the Parmesan into the broth mixture and then stir in the mushrooms. Add 1 cup of the fried onions. Pour into the slow cooker and stir until the beans are coated. Cover and cook for 4 hours on Low.

  6. When ready to serve, melt the remaining 1 tablespoon butter in a microwavable bowl, stir in the panko until mixture resembles wet sand, and add the remaining fried onions. Spoon the topping over the cooked beans just before serving.

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Yum! Green bean casserole is one of my favorites, and I love that this is made in a slow cooker. That will free up oven space for holiday cooking!

I only grew to like green beans in adulthood and I am very glad that I did. This is a very yummy way of eating green beans. Ready made French Fried Onions are not available in South Africa so we made our own. Who would have guessed that mushrooms go so well with beans? If you like green beans you will definitely LOVE this dish!


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