Green Bean Casserole Recipe
Tender green beans baked in a creamy mushroom sauce and topped with golden crispy fried onions.
Contains: Milk · Soy · Wheat
Check the labels of the condensed cream of mushroom soup, soy sauce and crispy fried onions you use. Formulations vary, and these packaged ingredients may contain additional allergens.
WHY IT WORKS
Why This Recipe Works
01
Keep the Sauce Creamy
Thawed green beans are patted dry before baking so they do not water down the creamy mushroom sauce.
02
Layer the Crispy Onions
Some crispy onions bake into the casserole for savory flavor, while the rest go on near the end so the topping stays crisp.
03
Finish Uncovered
Baking uncovered lets the filling bubble and thicken while the final layer of onions turns golden rather than steaming soft.
WHAT YOU’LL NEED
Equipment
THE RECIPE
Ingredients & Method
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Method
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Heat the oven to 350°F. Lightly grease an 8-inch square baking dish.
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In a large mixing bowl, whisk the condensed cream of mushroom soup, milk, soy sauce and black pepper until smooth. Fold in the green beans and 2/3 US cup of the crispy fried onions. Transfer to the baking dish and spread the mixture evenly.
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Bake uncovered for 25 minutes, until the filling is hot and bubbling around the edges.
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Gently stir the casserole, then scatter the remaining 2/3 US cup crispy fried onions evenly over the top. Bake for 5 minutes more, until the onions are golden and the filling is bubbling. If the topping needs more color, bake for another 2 to 3 minutes while watching closely.
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Let the casserole rest for 5 minutes before serving so the sauce can thicken slightly.
COOKING GUIDANCE
Practical Cooking Notes
Make Ahead
Combine the green beans, condensed soup, milk, soy sauce and black pepper in the baking dish, cover and refrigerate for up to 24 hours. Keep the crispy onions separate. Before baking, stir 2/3 US cup of the onions into the cold casserole; it may need 5 to 10 extra minutes in the oven before the final topping is added.
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Recipe Notes
Ingredient Notes
Frozen cut green beans give a dependable texture and keep prep simple. Thaw them fully and pat them dry before mixing so excess water does not thin the sauce. The condensed mushroom soup supplies most of the seasoning and body, so taste before adding any extra salt.
Useful Substitutions
Well-drained canned green beans can replace the frozen beans for a softer, more traditional casserole texture. Two-percent milk can replace whole milk, and low-sodium soy sauce works well if you prefer more control over the salt level.
INGREDIENT QUALITY
Quality Note
Thaw the green beans fully and blot them dry before mixing. Excess surface water is the main thing that can turn the creamy mushroom sauce thin, while adding the final crispy onions only near the end keeps the topping crunchy.
SPEND LESS
Cost-Saving Tip
Store-brand frozen green beans, condensed mushroom soup and crispy fried onions all work well here. Compare unit prices on the onions in particular, because larger containers are often better value if you make casseroles or use them as toppings regularly.
COOKING TIPS
Tips
Dry the Green Beans
After thawing, blot the green beans well with paper towels or a clean kitchen towel. Less surface water means a thicker, creamier casserole.
Keep the Sauce Thick
Use the stated amount of milk rather than thinning the condensed soup further. The green beans release a little moisture as the casserole heats.
Add the Final Onions Late
Wait until the filling is already hot and bubbling before adding the last layer of crispy onions. They need only a short bake to turn golden.
Rest Before Serving
Let the casserole stand for 5 minutes after baking. The sauce thickens slightly as it settles, making the portions easier to serve.
MAKE IT LAST
Storing, Freezing & Reheating
Storing
Refrigerate the casserole within 2 hours in a covered, shallow container and use it within 3 to 4 days.
Freezing
Freeze cooled portions in airtight containers. The sauce and onions will soften after thawing, so for the best texture use within about 2 months and add a small handful of fresh crispy onions when reheating.
Reheat in the Oven
Cover the casserole and warm it at 325°F until it reaches 165°F throughout. Uncover near the end and add fresh crispy onions if you want to restore some crunch.
Reheat in the Microwave
Cover an individual portion and microwave in short intervals, stirring where practical, until it reaches 165°F throughout. The onion topping will be softer than when freshly baked.
ESTIMATED PER SERVING
Nutrition
1 of 8 servings
Nutrition information is an estimate. Where shown, % Daily Value uses standard US Daily Values for adults and children aged 4+; actual values vary with ingredient brands, exact quantities and portion size.
QUESTIONS
Green Bean Casserole FAQs
Can I use canned green beans instead of frozen?
Yes. Use about 4 US cups well-drained canned cut green beans. The casserole will be a little softer, which is closer to the texture of many traditional versions.
Can I make this casserole with fresh green beans?
Yes. Trim and cut fresh green beans, then cook them until just crisp-tender before using. Drain and dry them well so they do not dilute the mushroom sauce.
Why did my green bean casserole turn watery?
The most common cause is excess water on the green beans. Thaw and dry frozen beans thoroughly, drain canned beans very well, and do not add more milk than the recipe calls for.
Can I prepare green bean casserole ahead of time?
Yes. Assemble the green beans and mushroom sauce up to 24 hours ahead, cover and refrigerate, and keep the crispy onions separate. Add the onions as directed when you are ready to bake.
Can I use two-percent milk instead of whole milk?
Yes. Two-percent milk works well and makes a slightly lighter sauce. Avoid adding extra milk, because a thinner mixture can make the finished casserole watery.
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