Soups & Stews
This Campbell's Mushroom Soup Green Bean Casserole recipe delivers the crispy golden top and creamy mushroom layer that makes it a holiday staple. š I first made this dish during my college years when I needed to stretch a budget while still creating something that felt like home cookingāMrs. Henderson would've been proud of how well it turned out.
The secret lies in the balance of textures: tender green beans, velvety mushroom soup, and that perfectly crunchy fried onion topping that everyone reaches for first.
The beauty of this recipe is its simplicityājust a few core ingredients that come together in one dish. You'll start with fresh green beans sautĆ©ed until tender-crisp, then layer them with Campbell's Cream of Mushroom Soup and milk for that signature creamy texture.
The magic happens when you top it with buttery fried onions that bake until golden and crispy, creating the contrast that makes this casserole unforgettable. It's the kind of dish that transforms a simple weeknight dinner into a comforting family meal.
What you'll end up with is a creamy mushroom-infused layer that's rich and satisfying, topped with crispy fried onions that add just the right amount of crunch.
The aroma alone will have everyone gathering around the table, and the first bite delivers that perfect combination of textures and flavors that makes this casserole a classic.
This recipe serves 6-8 and takes about 45 minutes to prepare, making it ideal for holiday gatherings or when you want to create a dish that feels special without the fuss.
One of the best things about this casserole is how versatile it isāit works as a side dish for roasted chicken or turkey, or even as a main course with a simple salad. The leftovers reheat beautifully, too, so you can enjoy it throughout the week.
Whether you're making it for the first time or perfecting your own version, this recipe is a foolproof way to bring back a taste of nostalgia with every bite.
Ingredients for campbells mushroom soup green bean casserole
Pantry staples and a few fresh ingredients for that nostalgic casserole magic.
| Ingredient | Amount | Notes |
|---|---|---|
| Fresh Green Beans š„¦ | 1 Ā½ lb | Trimmed and cut into 2-inch pieces |
| Campbell's Cream of Mushroom Soup š | 2 cans | 9 oz each, undiluted |
| Whole Milk š„ | Ā½ cup | Full-fat for creaminess |
| Yellow Onions š§ | 1 whole | Thinly sliced for frying |
| Unsalted Butter š§ | Ā½ cup | Cold, cubed for frying |
| All-Purpose Flour š¾ | Ā½ cup | For crispy topping |
| Salt š§ | 1 Ā½ tsp | Kosher or sea salt |
| Black Pepper š¶ļø | Ā½ tsp | Freshly ground preferred |
| Garlic Powder š§ | Ā½ tsp | For seasoning |
| Ground Black Pepper š¶ļø | Ā¼ tsp | For extra flavor |
| Shredded Cheddar Cheese š§ | Ā½ cup | Optional for extra richness |
The green beans are your star hereāfarm-fresh or frozen work perfectly. If using frozen, no need to thaw; just drain and pat dry. For the onions, yellow or white both work, but yellow adds a touch of sweetness. The Campbell's soup is non-negotiableāit's the secret to that creamy texture everyone loves. Grab the 9 oz cans from any grocery store, but check the shelf for the ones with the most recent date. Fresh milk makes the difference hereāwhole milk gives the richest flavor, but 2% works in a pinch. If you're feeling fancy, Trader Joe's has the best-priced heavy cream for an extra-luxurious version.
No Campbell's soup? Homemade mushroom sauce worksājust blend cooked mushrooms, milk, and a splash of cream. Short on green beans? Broccoli or asparagus can sub at the same weight. The fried onions are where the magic happensāif you skip the flour, they'll stick together. Panko breadcrumbs make a great alternative for extra crunch. Want to cut costs? Store-brand butter works just as well as name brands. The cheese is optional but worth itāsharp cheddar melts best, but any cheese you have will add flavor. Don't overcook the green beansāthey should stay tender-crisp, not mushy.
This casserole reheats like a dreamājust cover with foil and warm at 350Ā°F for 15-20 minutes. Leftovers keep in the fridge for 4-5 days, though I've never had any last that long. For holiday gatherings, double the recipeāit's always a crowd-pleaser. The fried onions stay crispy for about 2 days if stored in an airtight container. Freeze the whole casserole (before baking) for up to 3 months
Why You'll Love This Recipe
- One-Pan Magic: I swear by thisājust blanch the green beans, sautĆ© onions in butter, dump in the soup and milk, then broil until golden. No pots, no pans, no stress. The creamy mushroom base does all the work while you stir once.
- Creamy Crunch Combo: That crispy fried onion topping paired with the velvety Campbellās mushroom soup? Itās the kind of contrast that makes you go back for thirds. The onions caramelize just enough to cut through the richnessātrust me, itās the secret weapon.
- Weeknight to Holiday: Between us, this is my go-to for potlucks, Thanksgiving leftovers, and lazy Sundays. Double the recipe, freeze half, and youāve got a dinner covered. Honestly, itās the kind of dish that feels fancy but costs next to nothing.
- Budget-Friendly Feast: Fresh green beans and onions are cheap, Campbellās soup is a pantry staple, and milk stretches the filling to feed four for under $10. Iāll be realāitās the kind of meal that makes me feel like Iām feeding a crowd without breaking the bank.
Step-by-step instructions for Campbell's mushroom soup green bean casserole
Here's how to create that perfect creamy layer and golden, crispy topping everyone loves.
š³ Step 1: SautĆ© the Onions Until Golden Brown
Melt the 0.5 cup unsalted butter in a large skillet over medium heat until it foams. Add the 1 whole yellow onion sliced thinly and cook for 8-10 minutes until the onions turn a beautiful golden brown color and are tender. This step builds the flavor foundation for your casserole.
I like to stir occasionally but not constantlyāyou want those onions to caramelize rather than just soften. If they start to stick, reduce the heat slightly. The onions should be soft enough to pierce with a fork but still hold their shape. Remove them from heat and set aside in a small bowl.
šØāš³ Step 2: Prepare the Creamy Mushroom Mixture
In a large mixing bowl, combine the 2 cans Campbell's Cream of Mushroom Soup, 0.5 cup whole milk, 1.5 teaspoons salt, 0.5 teaspoon black pepper, 0.5 teaspoon garlic powder, and 0.25 teaspoon ground black pepper. Stir until everything is completely smooth and well combined.
Add the sautĆ©ed onions to the soup mixture and stir again. The warm onions will help infuse their caramelized flavor into the creamy base. This is where the magic happensāthe combination of the rich soup, creamy milk, and sweet onions creates that signature flavor you love in green bean casserole.
š„ Step 3: Assemble the Casserole in a Baking Dish
Preheat your oven to 350Ā°F. In a large, oven-safe baking dish (about 9x13 inches), spread the 1.5 lb fresh green beans evenly across the bottom. The beans should be in a single layer, not overlapping.
Pour the creamy mushroom mixture evenly over the green beans, making sure each bean is coated with the sauce. This ensures every bite has that creamy, mushroomy goodness. If you're using the optional 0.5 cup shredded cheddar cheese, sprinkle it evenly over the top now. This step is crucial for that perfect balance of flavors in every forkful.
š„ Step 4: Create the Crispy Topping
In a medium bowl, melt the remaining 0.5 cup unsalted butter (if you didn't use all of it in Step 1) and mix it with the 0.5 cup all-purpose flour until you have a smooth, crumbly mixture. This is your crispy toppingādon't skip this step if you want that classic crunch!
Sprinkle the butter-flour mixture evenly over the top of the casserole. Use your fingers or a fork to spread it out in an even layer. I like to press down gently with my fingers to help create a more uniform, crispy surface. This topping is what makes this dish specialāit should be golden brown and crunchy when done.
ā° Step 5: Bake Until Bubbly and Golden
Bake the casserole uncovered in the preheated 350Ā°F oven for 45-50 minutes until the top is a deep golden brown and the edges are bubbling. You'll know it's ready when the top looks crispy and the edges are slightly browned.
Real talk: don't open the oven door during the last 15 minutes of baking. The heat loss will cause the topping to soften, and we're going for that perfect crispy finish. When it's done, let it rest for 5 minutes before servingāthis gives the juices time to set and makes cutting easier. Serve warm with crusty bread for the ultimate comfort food experience!
Pro Tips For Making Campbells Mushroom Soup Green Bean Casserole
- Blanch Beans First: Toss fresh green beans in boiling water for 3-4 minutes, then plunge into ice waterāthis stops cooking and keeps them vibrant. I learned this the hard way: skipping this step gives you mushy beans by the time the casserole finishes baking.
- SautĆ© Onions Low: Cook the onions in butter over medium-low heat until soft, not browned. After burning three batches, I finally figured out that rushing this step adds bitterness that even the mushroom soup canāt mask.
- Stir the Soup: Whisk the Campbellās soup and milk together before adding it to the beansāthis prevents clumping. I was skeptical until I tried it: the texture goes from grainy to silky smooth in seconds.
- Topping Goes Last: Sprinkle the fried onion topping after baking, not beforeāitāll crisp up better and look fresher. Sounds weird, but it works: the heat from the casserole reheats the onions just enough to make them golden and crunchy.
Make-ahead tips for this campbells mushroom soup green bean casserole
Prep Ahead Strategy
This casserole is a make-ahead dream! Assemble the entire dishāgreen beans, creamy soup mixture, and crispy toppingāup to 24 hours ahead in a 9x13-inch baking dish. Cover tightly with plastic wrap and refrigerate.
When ready to bake, simply remove the plastic and bake at 350Ā°F for 50-55 minutes (the extra time accounts for the cold start). I always do this when hosting Thanksgivingāit cuts down on last-minute stress. š
Freezer-Friendly Assembly
For maximum convenience, assemble the casserole in your baking dish, cover with foil, then wrap the entire dish in plastic wrap. Freeze for up to 3 months.
When ready to bake, thaw in the fridge overnight, then bake at 350Ā°F for 60-65 minutes (covered for first 30 minutes, then uncovered). The texture stays perfectājust like grandma's! āļø
Onion Prep Shortcut
Save time by prepping the fried onions 2 days aheadāthey keep beautifully in an airtight container. Store them at room temperature if using within 48 hours, or refrigerate for up to 1 week.
Just sprinkle them on top right before baking for that fresh-from-the-oven crunch. I keep a jar of these in my pantry for quick casserole assembly. š§
Double Batch for Crowds
For gatherings, double the recipe and bake in two 9x13-inch dishes simultaneously. Use the same baking time but rotate the pans halfway through for even browning. I always make two when hostingāthis casserole disappears faster than you can say "holiday leftovers." š«
Reheating Leftovers
Leftover casserole reheats beautifully! Cover with foil and warm at 350Ā°F for 15-20 minutes until bubbly. For microwave reheating, cover with a damp paper towel and heat in 1-minute intervals on medium power. Add a splash of milk if it looks dryāthis keeps the creamy texture intact. š„
Garnish Just Before Serving
For that restaurant-quality finish, sprinkle extra crispy fried onions on top right before serving. I also like adding a few fresh parsley leaves for colorāit brightens up the dish without overpowering the flavors. This simple garnish makes your casserole look (and taste) like it came from a fancy dinner. āØ
Nutrition facts
Frequently asked questions
Can I use frozen green beans instead of fresh?
Frozen green beans work perfectlyājust drain and pat them dry before adding to the casserole. They save time and often have a more consistent texture. Thaw them first if they're still icy cold, or use them straight from the freezer (no need to thaw completely). The cooking time in the oven will handle any remaining ice crystals.
Why does my crispy topping turn soggy?
The most common reason is opening the oven door too early. Let the casserole bake undisturbed for the last 15 minutes to maintain crispiness. Another trick: Spread the butter-flour mixture thinner and bake at 375Ā°F for the last 10 minutes to boost browning. If it still softens, try adding 1 tablespoon cornstarch to the flour mixture for extra crunch.
What can I substitute if I don't have Campbell's Cream of Mushroom Soup?
Make a quick homemade version by blending 1 cup cooked mushrooms, 1/2 cup milk, and 2 tablespoons butter until smooth. For a faster option, use 1/2 cup sour cream or Greek yogurt mixed with 1/2 cup milk and 1 teaspoon mushroom powder (found in spice aisles). The texture will be slightly different but still delicious.
Can I make this casserole in a smaller dish?
Yes! For a 8x8-inch dish, reduce the recipe by half. The baking time stays the same (45-50 minutes), but check for doneness at 40 minutes since smaller dishes can overcook faster. If using a 9x13-inch dish, keep the original quantities. The key is maintaining the same depth of ingredients for even cooking.
How do I make this dish vegetarian?
Swap the Campbell's Cream of Mushroom Soup for a vegetarian-friendly mushroom sauce (like Imagine brand). Use vegetable broth instead of milk if avoiding dairy, and ensure your butter is plant-based. The fried onions and green beans remain the same. For extra richness, stir in 1/2 cup nutritional yeast or cashew cream into the sauce mixture.