Campbell's String Beans Casserole Recipe: Cheesy, Crispy Top With Creamy Center

This Campbell's string beans casserole recipe delivers the ultimate comfort food experience with its crispy golden top and creamy, cheesy center—the kind of dish that warms up a chilly evening and brings back childhood dinner memories.

I first made this version after realizing my original recipe needed that perfect textural contrast between the crunchy breadcrumb topping and velvety bean mixture. The secret lies in baking the casserole just until the top turns golden brown while keeping the center tender and bubbly.

The beauty of this recipe is its simplicity—just a handful of pantry staples and 30 minutes of prep time transform into a restaurant-quality dish that's perfect for family dinners or potlucks.

I've tested this recipe countless times, adjusting the baking time to ensure the breadcrumbs get properly crispy without burning, while the creamy bean mixture stays rich and flavorful. The combination of Campbell's cream of mushroom soup and cheddar cheese creates that signature tangy, savory depth that makes this casserole irresistible.

What you'll end up with is a creamy, cheesy string bean casserole topped with perfectly crispy breadcrumbs that hold their shape until the very last bite.

The aroma alone will have everyone gathering around the table, and the first forkful delivers that perfect balance of textures—crunchy, creamy, and satisfying all at once. This is comfort food at its finest, with just the right amount of indulgence to make it special.

Serve this casserole warm with a side salad or crusty bread to soak up every last bit of that rich, creamy sauce. The leftovers reheat beautifully, making it an excellent meal prep option for busy weeknights.

Let's get started on creating this classic dish that brings warmth and nostalgia to any table.

Ingredients for campbell's string bean casserole

Pantry staples transformed into nostalgic comfort—crispy, cheesy, and utterly satisfying every bite.

The Campbell's cream of mushroom soup is the heart of this dish—don't skimp on quality. Grab the condensed version (10.5 oz cans) from the grocery store's soup aisle, not the powdered kind. For the string beans, fresh works best, but frozen is a perfect substitute (no thawing needed). I always trim the ends and cut them into 2-inch pieces—even lengths cook uniformly. The sharp cheddar is non-negotiable; pre-shredded gets clumpy, so buy a block and grate it yourself. For the breadcrumbs, Japanese-style panko gives that perfect crunch, but regular panko works in a pinch. Stock up on these at Walmart or Costco—they're cheaper in bulk.

No Campbell's soup? Homemade mushroom cream sauce works—sauté mushrooms, garlic, and shallots until soft, then blend with cream, butter, and a splash of milk. Swap the sharp cheddar for Monterey Jack if you prefer milder flavor, but the tangy bite of cheddar is what makes this dish sing. Running low on panko? Crushed cornflakes or Ritz crackers add crunch too. The French fried onions are optional but add that restaurant-quality touch—Trader Joe's sells them pre-made for convenience. For extra richness, add a splash of cream cheese to the casserole filling before baking. And if you're watching carbs, use almond flour instead of panko for the topping—it still gets crispy!

This casserole tastes even better the next day—make extra for leftovers. Store in an airtight container in the fridge for up to 4 days, or freeze portions for 3 months. Reheat covered at 350°F until bubbly. The breadcrumb topping reheats best when covered with foil for the first 10 minutes, then uncovered to crisp up. For meal prep, assemble the casserole in a greased baking dish the night before and refrigerate—bake straight from cold. The aroma alone will have your whole house smelling like comfort food. And if you're serving at a potluck? Bring it in a disposable foil pan—it stays hot and crispy for hours.

Step-by-step instructions for Campbell's string beans casserole

Here's how to create a showstopping casserole with a golden, crispy topping and velvety cheesy center.

Start by trimming the ends from the 2 lbs of green string beans and cutting them into 2-inch pieces. This size ensures even cooking and maximum texture contrast in the finished dish. Transfer the trimmed beans to a large pot of boiling salted water and blanch for exactly 3 minutes - this preserves their vibrant color while softening them just enough to absorb the creamy sauce later.

Immediately drain the beans in a colander and rinse them under cold water to stop the cooking process. The beans should be bright green and slightly tender but still hold their shape when pressed between your fingers. This blanching step is crucial - overcooking here will result in mushy beans in your casserole. Spread them on a baking sheet and let them cool completely before proceeding.

In a large mixing bowl, combine the 2 cans of Campbell's Cream of Mushroom Soup, 0.5 cup of milk, 0.25 cup of heavy cream, 1 tbsp of garlic powder, 1 tbsp of onion powder, 1 tsp of salt, and 0.5 tsp of black pepper. Whisk vigorously until completely smooth - you want to eliminate any lumps that could create texture issues in your final dish. The sauce should be thick but pourable at this stage.

Next, add the cooled green string beans to the sauce mixture and toss gently to coat each piece evenly. The beans should be fully immersed in the sauce but not swimming - if it appears too thin, whisk in 1 tbsp of the all-purpose flour to help thicken it slightly. This step ensures every bite delivers that perfect combination of creamy sauce and tender beans.

Preheat your oven to 375°F while you prepare the topping. In a separate bowl, combine the 1.5 cups of Panko breadcrumbs, 2 cups of shredded sharp cheddar cheese, 0.25 cup of all-purpose flour, 0.25 tsp of ground nutmeg, and the remaining 0.5 tsp of black pepper. The mixture should look like coarse, cheesy breadcrumbs ready for the oven.

Spread the bean and sauce mixture evenly into a greased 9x13-inch baking dish. For that perfect crispy topping, sprinkle the cheddar-Panko mixture evenly over the top, pressing down gently to ensure good contact with the creamy layer below. This compression creates the ideal texture contrast we're aiming for - crispy on top, creamy within.

Bake the casserole uncovered for 35-40 minutes until the top is golden brown and the edges are bubbling. The key visual cue is when the cheese begins to brown in spots - this indicates the Panko is crisping properly. If the top browns too quickly before the center is hot, tent loosely with aluminum foil for the remaining baking time.

For the final touch, remove from the oven and sprinkle the 0.25 cup of French fried onions evenly over the top. Return to the oven for just 2-3 minutes to toast the onions slightly - this adds that irresistible crunch factor. The internal temperature should reach 165°F when checked with an instant-read thermometer, ensuring the center is fully heated through.

Allow the casserole to rest for 10 minutes before serving. This resting period lets the layers set properly and prevents any potential sliding when you cut into it. The crispy topping will firm up slightly while the creamy center maintains its luxurious texture.

Cut into squares and serve immediately - each bite should deliver that perfect combination of crispy, cheesy topping with the creamy mushroom and bean filling beneath. The French fried onions add that final textural element that makes this dish truly exceptional. Leftovers reheat beautifully, with the crispy topping softening slightly but still providing that satisfying contrast.

Storing and reheating your campbell's string bean casserole

Fridge Storage Essentials

This casserole keeps beautifully in the fridge for up to 4 days in an airtight container—I swear by glass Pyrex with snap-on lids for even heating later. Let it cool completely before storing to prevent condensation that can make the breadcrumb topping soggy.

I always portion it into individual servings so you can reheat just what you need without dealing with a whole pan. 🧊

When reheating, cover with foil and bake at 350°F for 15-20 minutes until bubbly. The key is to cover it first to restore the crispy texture, then uncover for the last 2-3 minutes to revive that golden brown color.

I've tested this method multiple times—it's the only way to get the topping right after refrigeration.

Freezer-Friendly Tips

For longer storage, freeze portions in quart-sized freezer bags with 1 inch of headspace for expansion. I label them with the date and reheating instructions—trust me, you'll thank yourself later. This casserole freezes for up to 3 months without losing its signature textures, though the breadcrumb topping will soften slightly.

That's actually a bonus when you're reheating for a quick weeknight meal! ❄️

To reheat from frozen, bake covered at 350°F for 45-50 minutes, then uncover and broil for 2-3 minutes to crisp the top. If it seems too dry after thawing, add 1-2 tablespoons of milk or cream before reheating—it'll revive that creamy center perfectly.

Make-Ahead Magic

Here's my pro tip: assemble the casserole completely in your baking dish, then refrigerate it overnight before baking. This cold-start method actually improves the texture—you'll get a crispier topping and more even cooking.

Just add 10-15 minutes to your baking time since it's coming from cold. I do this all the time for potlucks—it's a crowd-pleaser that requires zero last-minute effort. 💡

For meal prep, I often make double batches and freeze half while keeping the other half in the fridge. That way, I always have a comforting dinner option ready. The flavors actually develop better over time, making it taste even more nostalgic the next day.

Just don't skip that resting period after baking—it's what keeps everything together when you serve it.

Frequently asked questions