Slow Cooker Green Bean Casserole

4.88 from 8 votes

Slow Cooker Green Bean Casserole

Slow Cooker Green Bean Casserole is an easy way to make a holiday favorite without taking up your oven space! All of the flavors your love in a traditional green bean casserole made with just 6 ingredients right in your slow cooker!

Prep Time10

Cook Time4

Total Time4 10

Course: Side Dish

Cuisine: American

Servings: servings

Author: Tiffany Azure

Ingredients

5 tablespoons butter
8 ounces baby bella or cremini mushrooms sliced
salt & cracked black pepper to taste
4 teaspoons minced garlic
4 tablespoons flour
1 ½ cups milk
½ cup heavy cream
¼ teaspoon nutmeg
1 cup shredded parmesan cheese
1 ½ pounds fresh green beans ends trimmed
½ cup French fried onions

Instructions

Heat 1 tbsp of the butter over a medium high heat in a high sided frying pan or a large saucepan. Once the butter is frothy, add the mushrooms and a pinch of salt, and cook until the mushrooms are soft and starting to color.
Add the garlic and cook for a few minutes more until aromatic. Season with black pepper, remove from the pan, and set aside.
Melt the remaining 4 tbsp of butter in the pan. Add the flour, and whisk for a few minutes to remove the ‘raw’ taste from the flour.
Gradually pour in the milk, whisking the whole time, until you have a smooth sauce. Keep on cooking, whisking often, until the sauce is thick enough to coat the back of a spoon.
Remove from the heat before stirring in the heavy cream, nutmeg and shredded parmesan. Whisk until smooth, add the cooked mushrooms, and season to taste with more salt and pepper, if needed.
Halve the green beans so that they fit in the slow cooker better, and transfer them to the cooking insert. Stir in the mushroom sauce.
Cover and cook on low for 4 hours, or until the beans are tender but still retain a little bit of their crunch. Depending on the size and shape of your slow cooker, you may need to stir occasionally during cooking to make sure the beans cook evenly.
Top the casserole with the French onions just before serving.

Notes

Small Batch: This recipe halves perfectly for smaller slow cookers.

Instant Pot: If you have a sear-and-stew model of slow cooker or use the slow cooker setting of an Instant Pot, the mushrooms can be cooked and the sauce can be made in the cooking insert.

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