Soups & Stews
This Campbell's Cream of Mushroom Soup Green Bean Casserole recipe brings back the comforting flavors of mid-century America, where every bite delivers nostalgic crunch and creamy richness.
The secret lies in layering tender green beans with velvety mushroom soup, then crowning it with crispy fried onions—a technique that’s been perfecting family dinners since the 1950s.
The beauty of this classic lies in its simplicity: just 15 minutes of prep, followed by 30 minutes in the oven, transforms basic ingredients into a dish that feels like a warm hug.
The creamy mushroom base blends seamlessly with the bright snap of green beans, while the golden onion topping adds that signature crunch we all love.
By the time it emerges from the oven, you’ll have a bubbling, golden casserole with layers of texture—creamy, tender, and crispy all at once. The aroma alone will have everyone gathering around the table, and the first bite delivers that nostalgic taste of childhood dinners.
It’s the kind of dish that tastes even better the next day, making it perfect for meal prep.
While this recipe stays true to tradition, I’ve included modern twists like vegan substitutions and lighter toppings, so you can enjoy the comfort without compromise. Let’s bring back this classic with a few simple steps and a lot of love.
Ingredients for campbell's cream of mushroom soup green bean casserole
Nostalgic comfort in a casserole dish—just 12 simple ingredients for a 1950s classic.
| Ingredient | Amount | Notes |
|---|---|---|
| Campbell's Cream of Mushroom Soup 🍄 | 2 cans | Condensed, 10.5 oz each |
| Fresh Green Beans 🥦 | 2 lbs | Trimmed, cut into 2-inch pieces |
| Yellow Onions 🧅 | 1 ½ cups | Diced, for fried onion topping |
| All-Purpose Flour 🌾 | ½ cup | For coating fried onions |
| Vegetable Oil 🫒 | 1 cup | For frying onion topping |
| Salt 🧂 | 1 ½ tsp | Kosher or sea salt |
| Black Pepper 🌶️ | ½ tsp | Freshly ground preferred |
| Garlic Powder 🧄 | ½ tsp | For seasoning green beans |
| Milk 🥛 | ½ cup | For creamier texture (optional) |
| Butter 🧈 | 2 tbsp | Unsalted, for extra richness |
| Shredded Cheddar Cheese 🧀 | 1 cup | Sharp cheddar preferred |
| French Fried Onions 🧅 | 1 cup | Store-bought or homemade |
The Campbell's soup is the heart of this dish—grab the condensed version for that perfect creamy texture. Fresh green beans are ideal, but frozen works in a pinch (no need to thaw). For the onions, Trader Joe's or Walmart have the best pre-diced yellow onions at a good price. The fried onion topping is key—if you're making it from scratch, coat the onions in flour first for extra crispiness. I always double the batch of topping because it disappears fast. The butter and milk combo makes this dish extra creamy, but you can skip the milk if you're watching calories.
No Campbell's soup? Homemade mushroom cream sauce works too—just sauté mushrooms, add cream and a splash of broth, then blend. Short on green beans? Substitute broccoli florets (they hold up well). The French fried onions can be skipped if you're avoiding extra fat, but trust me, they're worth it. For a lighter version, use low-fat milk and less cheese. The garlic powder is optional but adds a nice depth—skip it if you're not a fan. Pre-shredded cheese is fine, but freshly grated melts better if you've got the time.
This casserole tastes even better the next day—make it ahead and refrigerate. Reheat covered at 350°F for 20 minutes. The fried onion topping stays crispy if you add it right before baking. Store leftovers in the fridge for up to 5 days or freeze for 3 months. I always make a double batch because it reheats beautifully for lunches. For extra crunch, sprinkle fresh parsley on top before serving—it brightens up the whole dish.
Why You'll Love This Recipe
- One-Pot Magic: Honestly, I swear by this recipe because it’s literally one pan, one bowl, and done. No chopping onions into oblivion—just slice them thin, sauté fast, and let the soup do the work. The green beans barely need trimming, and the flour-oil mix for the crispy topping? Five minutes max.
- Creamy Crunch Combo: That creamy mushroom soup base with the golden, buttery topping? It’s the best of both worlds—smooth richness with a satisfying crunch. The onions add a sweet bite that cuts through the richness, and the green beans stay tender without turning to mush. (Yes, even on a Tuesday night.)
- Meal Prep MVP: Between us, this is my go-to for lunches all week. Make a big batch, portion it out, and reheat—it holds up perfectly. Bring it to potlucks, pack it for work, or freeze half for when you’re too tired to cook. The topping stays crispy even after reheating (if you microwave it right).
- Budget-Friendly Luxury: Fresh green beans might sound fancy, but this recipe stretches them far. A single can of soup, a small onion, and a handful of beans make enough for four servings. It’s the kind of dish that feels like a restaurant meal but costs less than takeout. Plus, you’re using pantry staples—no weird ingredients to hunt down.
Step-by-step instructions for Campbell's cream of mushroom soup green bean casserole
Here's how to make this classic comfort dish with that perfect crispy topping.
Blanch and Season the Green Beans
Trim the ends from the 2 lbs of fresh green beans and cut them into 2-inch pieces. Bring a large pot of salted water to a boil and add the green beans. Cook for 3-4 minutes until they're bright green and tender-crisp. Drain immediately and transfer to a large bowl.
While they're still warm, sprinkle with 1.5 tsp salt, 0.5 tsp black pepper, and 0.5 tsp garlic powder. Toss gently to coat evenly. The seasoning will stick better to warm beans, and this step adds flavor before the casserole baking. Let them cool slightly while you prepare the soup mixture.
Prepare the Creamy Mushroom Sauce
In a separate large bowl, open the 2 cans of Campbell's Cream of Mushroom Soup and stir them together with a whisk. Add the 0.5 cup milk and 2 tbsp butter, whisking until smooth. The milk adds creaminess without making the casserole too heavy. If you prefer a richer texture, you can add a splash more milk, but stick to the 0.5 cup for the classic balance.
Fold the seasoned green beans into the soup mixture, coating them evenly. The beans should be fully immersed in the creamy sauce. This step ensures every bite has that perfect combination of tender green beans and rich mushroom flavor. Taste and adjust seasoning if needed—sometimes the canned soup needs a little extra salt or pepper to taste right.
Make the Crispy Fried Onion Topping
In a medium bowl, combine the 1.5 cups diced yellow onions and 0.5 cup all-purpose flour. Toss until the onions are completely coated. Heat 1 cup vegetable oil in a large skillet over medium heat until it reaches 350°F. Working in batches, carefully add the onion mixture to the hot oil and fry for 3-4 minutes until golden brown.
Transfer the fried onions to paper towels to drain excess oil. They should be crispy and golden—this is the signature crunch that makes this casserole special. If you're using store-bought French fried onions, skip this step and use the 1 cup directly in the next step. The homemade version adds extra texture and flavor, but both work perfectly.
Assemble and Bake the Casserole
Preheat your oven to 375°F. Transfer the green bean and soup mixture to a greased 9x13-inch baking dish. Spread it evenly, mounding the edges slightly. Sprinkle the 1 cup shredded cheddar cheese evenly over the top, then scatter the fried onions (homemade or store-bought) over the cheese.
Bake uncovered for 25-30 minutes until the top is golden brown and bubbly. The cheese should be melted and the onions crispy. If the top browns too quickly, tent loosely with foil for the last 5-10 minutes to prevent over-browning. The casserole is done when it's heated through and the edges are bubbling.
Rest and Serve
Remove the casserole from the oven and let it rest for 5 minutes before serving. This resting time allows the cheese to set slightly and makes it easier to cut clean slices. The crispy topping will be at its best right out of the oven, so serve immediately while it's hot.
Cut into squares and serve with crusty bread or a simple green salad. The combination of creamy mushroom sauce, tender green beans, and crispy fried onions creates the perfect balance of textures and flavors that makes this dish a classic. Enjoy your homemade version of this nostalgic favorite!
Pro Tips For Making Campbell'S Cream Of Mushroom Soup Green Bean Casserole
- Trim the Beans First: Cut green beans into 1-inch pieces before blanching—this speeds up cooking and keeps them even. I used to skip this and ended up with some undercooked stalks peeking through the creamy sauce. (Yes, even if you’re impatient like me.)
- Sweat the Onions Low: Cook onions in oil over medium-low heat until translucent, not browned—this prevents bitterness that’ll fight with the mushroom soup’s flavor. After burning three batches, I finally figured out patience pays off here.
- Skip the Overmixing: Once you stir the flour-oil roux into the soup, mix just until combined—overworking it turns the sauce gummy. My grandmother swore by this, and she was right: the creamy texture stays smooth when you treat it gently.
- Bake Until Bubbly: Cover the casserole with foil for the first 20 minutes, then uncover and bake 10–15 more until the top is golden and the edges bubble. Sounds weird, but it works: this two-step method guarantees a crispy top without a dry bottom. (Your future self will thank you.)
Serving suggestions for campbell's cream of mushroom soup green bean casserole
Classic Comfort Pairings
Serve this nostalgic casserole with warm crusty French bread or sourdough rolls to soak up every last bit of creamy mushroom sauce. The golden crust contrasts beautifully with the dish's rich texture. I always keep a basket of warm dinner rolls on the table—they disappear fast! 🥖
For a lighter touch, pair it with a simple arugula salad tossed in lemon vinaigrette. The peppery greens cut through the richness while keeping the meal balanced. Add toasted walnuts for crunch if you want extra texture. This combo feels fresh yet still comforting.
Holiday Feast Elevations
Transform this into a centerpiece for Thanksgiving or Christmas by adding roasted Brussels sprouts on the side. Their caramelized edges complement the casserole's creamy depth. I also like serving it with mashed sweet potatoes—the sweetness balances the savory flavors perfectly. 🍠
For a festive touch, garnish individual servings with fresh parsley or chives right before serving. The bright green adds visual contrast to the golden casserole. A sprinkle of smoked paprika over the fried onions adds warmth that ties into holiday spices.
Modern Twist Sides
Swap traditional sides for lighter options like quinoa salad with cherry tomatoes and cucumber. The bright flavors refresh the palate between bites of creamy casserole. I also love pairing it with roasted asparagus—the crisp-tender texture adds a sophisticated touch to the classic dish. 🥦
For a protein boost, serve alongside garlic-herb grilled chicken or pan-seared pork chops. The savory meat balances the richness of the mushroom sauce. If you're keeping it vegetarian, white beans tossed with olive oil and herbs make a hearty pairing.
Leftovers Reinvented
Turn leftover casserole into breakfast hash the next day. Cube and pan-fry with potatoes and bacon for a hearty morning meal. The crispy onions add extra crunch to this unexpected twist. I often add a fried egg on top for extra richness. 🍳
For a quick lunch, serve cold slices over mixed greens with a drizzle of ranch dressing. The creamy sauce becomes a tangy dressing that ties everything together. Add crumbled bacon or avocado chunks for extra flavor. This cold version is perfect for busy weekdays!
Nutrition facts
Frequently asked questions
Can I make this casserole ahead of time?
This dish tastes even better the next day. Assemble it completely, cover tightly with foil, and refrigerate for up to 24 hours before baking. For make-ahead baking, cover and refrigerate overnight, then bake at 375°F for 35-40 minutes (5-10 minutes longer than fresh). The flavors meld beautifully overnight.
What if I don't have Campbell's Cream of Mushroom Soup?
No problem! Make a quick substitute by sautéing 8 oz mushrooms in butter, adding 1 cup heavy cream and 1 tsp soy sauce, then simmering until thickened. For a vegan option, use cashew cream (blended soaked cashews + water) with mushroom broth. The texture will be slightly different but still delicious.
How do I keep the fried onions extra crispy?
For maximum crunch, fry the onions in batches at 350°F until golden brown, then drain on a wire rack (not paper towels) to remove excess oil. For the casserole, add them right before baking—this prevents sogginess. If using store-bought fried onions, sprinkle them on just before the final 5 minutes of baking.
Can I make this casserole without cheese?
Yes! The cheese adds richness, but you can skip it entirely. For a lighter version, top with crushed Ritz crackers mixed with a little melted butter instead. The creamy mushroom sauce and crispy onions still deliver that classic comfort flavor without dairy. For extra umami, add a sprinkle of nutritional yeast on top.
Why did my casserole turn out watery?
Watery results usually mean the beans weren't drained well or the soup mixture was too thin. Always drain beans thoroughly after blanching, and if using frozen beans, thaw and pat dry first. For extra insurance, simmer the soup mixture (without beans) for 2-3 minutes to thicken slightly before adding the beans. The milk and butter should create a creamy base, not a sauce.