Why is my green bean casserole soupy, and how can I prevent it?

A soupy green bean casserole usually happens because of excess moisture or sauce that wasn't thickened enough before baking. Make sure the green beans are thoroughly drained after blanching and the ice bath. Also, don't rush the mushroom sauce. Cook the flour with the mushrooms for about 3 minutes before adding the liquids and allow the sauce to simmer for about 10 minutes to help it reach the right consistency. The sauce should be thick enough to coat the back of a spoon before it goes into the baking dish.

How can I add more flavor to green bean casserole?

My best tip is to make the mushroom cream sauce from scratch. Fresh mushrooms, sautéed onion, garlic, and a little black pepper create a much more flavorful base than canned cream of mushroom soup. Then, my favorite flavor trick is adding a teaspoon of soy sauce. It brings out the savory, earthy flavor of the mushrooms. Also, use baby bella mushrooms instead of white button mushrooms to add more depth.

Can I make green bean casserole in a slow cooker?

I prefer the oven for this version because it helps preserve the texture of the fresh green beans and keeps the fried onion topping crispy. But to adapt the recipe for a slow cooker, blanch the green beans and prepare the mushroom sauce on the stovetop as directed. Combine them in a greased slow cooker and cook on low for 2-3 hours. Then add the French fried onions during the last 15-20 minutes with the lid slightly ajar, or transfer the casserole to an oven-safe dish and broil briefly to crisp the topping. Keep in mind that slow cooker times can vary, and the beans will generally become softer with this method.

Green Bean Casserole

Servings: 10-12 1x

Scale

Ingredients

2 lbs fresh green beans, ends trimmed, cut in half
3 tablespoons salted or unsalted butter
1 medium yellow onion, finely chopped (~ 1½ cups)
3 garlic cloves, minced
8 ounces baby bella or white button mushrooms, finely chopped
½ teaspoon fine salt, plus more to taste
½ teaspoon fresh ground black pepper
¼ cup all-purpose flour
1 cup low-sodium chicken broth
1 cup half and half
1 teaspoon soy sauce
6 ounces french fried onions

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Instructions

Preheat the oven to 375° F. Grease a 9×13 glass baking dish with butter or mist it with cooking spray; set aside.
Bring a large pot of lightly salted water to a boil. While the water comes to a boil, fill a large bowl with ice water to create an ice bath.
Once the water is boiling add the green beans and cook until they are just tender and bright green, 5-7 minutes.
Drain the green beans in the sink through a colander then immediately plunge the beans into the ice bath to stop the cooking process. NOTE: This will prevent the beans from becoming overcooked and mushy. Drain the beans again; set aside.
Place a large skillet over medium heat. Add the butter and, when the butter is melted, add the onions, mushrooms and garlic. Cook and stir until the onions start to soften and the mushrooms release their liquid, 5-6 minutes, stirring occasionally.
Season with the salt and pepper. Then sprinkle the flour over the mushroom-onion mixture and stir to combine. Continue to cook for 2 to 3 minutes while stirring constantly.
Add the broth and stir until all of the flour has been incorporated.
Reduce the heat slightly to hold it just above medium-low. Stir in the half-and-half and soy sauce. Cook the sauce until thickened, stirring occasionally, about 10 minutes. Taste and adjust the salt and pepper if necessary.
Place the blanched and drained green beans in the prepared baking dish.
Pour the mushroom mixture over the green beans and stir well to combine.
Place the dish in a preheated oven and bake, uncovered, for 20 minutes.
Remove the baking dish from the oven, stir, and then sprinkle the french fried onions over the top. Return to the oven and bake until bubbly and the onions are golden brown, about an additional 5-7 minutes.
Remove the baking dish from the oven and let it cool for 5 minutes before serving.
Store leftovers in an airtight container in the refrigerator for up to 4 days.

Notes

For gluten free, use gluten-free 1:1 flour, tamari instead of soy sauce, and use gluten-free crispy fried onions, such as MaeMai or Feel Good Foods brands.

For vegetarian, use vegetable broth instead of chicken broth. For vegan, use vegetable broth, plant-based butter, and check that the fried onions are vegan.

Nutrition Information

Serving Size: 1/12th of the recipe or ~⅔ cup
Calories: 186
Fat: 12 g
(Sat Fat: 6 g)
Sodium: 255 mg
Carbohydrate: 16 g
(Fiber: 3 g
Sugar: 4 g)
Protein: 3 g
Cholesterol: 15 mg

Dietary

Egg-Free Gluten-free Nut-free Vegetarian

Recipe By: Jessica Beacom