Campbell's String Bean Casserole Recipe: Cheesy, Crispy-Top Comfort in One Pan

This Campbell's string bean casserole recipe brings back the comforting flavors of childhood dinners—creamy, cheesy, and topped with that signature crispy breadcrumb crust. 💛 I remember my Nonna making a version of this in our tiny Boston kitchen, where the aroma alone could fill the whole triple-decker with warmth.

The secret lies in balancing the tangy Campbell's soup with just the right amount of melted cheese and crispy topping, creating a dish that's both nostalgic and satisfying.

What makes this recipe special is how it delivers restaurant-quality comfort in a single baking dish, with minimal prep and cleanup.

You'll start by sautéing onions and garlic for a flavorful base, then layer in the Campbell's soup, string beans, and cheese—all before topping it with buttery breadcrumbs for that coveted crispy finish. The dish bakes up tender yet firm, with a golden crust that's impossible to resist.

By the time it comes out of the oven, you'll have a dish that's creamy, cheesy, and perfectly crispy on top—a true one-pan wonder that works as a hearty side or even a light main course.

The flavors are rich and comforting, with just the right balance of tangy soup and creamy cheese, all held together by that satisfying crunch. It's the kind of recipe that brings people together, just like it did in my Nonna's kitchen.

This recipe is incredibly versatile—swap in fresh green beans for canned, add bacon for extra richness, or use a different Campbell's soup flavor to customize it to your taste.

The beauty of this dish is in its simplicity and adaptability, making it perfect for family dinners, potlucks, or even a cozy weeknight meal. Let's get started!

Ingredients for campbell's string bean casserole

Pantry staples and a few fresh ingredients—this casserole brings back childhood comfort in one pan.

The Campbell's soup is the heart of this dish—Cream of Mushroom gives that creamy, tangy base, but Cream of Celery works too if you prefer. Grab the 10.5 oz cans (condensed) from any grocery store—just make sure they're not dented. For the string beans, fresh ones have better texture, but canned works in a pinch. The onion and garlic are your flavor foundation—sauté them until soft so they don't overpower the dish. I always grab yellow onions from the store brand; they're sweet and consistent. Skip the pre-chopped garlic—freshly minced makes all the difference.

No panko? Regular breadcrumbs toasted in butter will work, but panko gives that perfect crispy texture. Short on cheddar? Swiss or Monterey Jack blend well—just use the same amount. The milk adds creaminess, but half-and-half or heavy cream makes it even richer. If you're feeling adventurous, add a dash of Worcestershire sauce to the soup for depth. The bacon bits? Only if you're feeling extra indulgent—Trader Joe's has the best pre-cooked ones. And if you're using fresh green beans instead of string beans, blanch them first to keep them bright.

This casserole tastes even better the next day—make it ahead and bake it fresh when company comes over. Keeps in the fridge for 4-5 days, covered tightly. For leftovers, reheat covered at 350°F for 15-20 minutes until bubbly. The topping gets soggy if you overheat it, so cover it loosely with foil if it's browning too fast. Portion into individual dishes before serving—everyone loves seconds.

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

Here's how to make this cheesy, crispy-topped classic that brings comfort to any table.

In a large oven-safe skillet, melt 0.5 cup unsalted butter over medium heat. Add the 1 whole yellow onion (finely chopped) and cook for 5-6 minutes until soft and translucent. You'll see the edges start to caramelize slightly—that's when you know it's ready.

Stir in the 3 cloves garlic cloves (minced) and cook for another 30 seconds until fragrant. This aromatic base forms the flavor foundation for your entire casserole. Don't let the garlic burn—it should smell wonderful but not bitter. Remove the skillet from heat temporarily while you prepare the beans.

In a medium bowl, combine the 2 cups string beans with 0.5 cup milk, 2 tbsp all-purpose flour, 1 tsp salt, and 0.5 tsp black pepper. Mix well to coat the beans evenly. The flour will help thicken the sauce and create that creamy texture we all love in this dish.

Add the bean mixture to the skillet with the sautéed onions and garlic. Stir in the 2 cans Campbell's Cream of Mushroom Soup and bring everything to a gentle simmer over medium-low heat. Let it cook for 3-4 minutes until slightly thickened. Here's where the magic happens—the soup and milk create that perfect creamy base.

Spread the bean mixture evenly in the skillet, creating a flat surface for the crispy topping. Sprinkle 1 cup sharp cheddar cheese evenly over the top, then add the 0.5 cup bacon bits (if using) for extra richness. The cheese will melt and create that irresistible gooey texture we're after.

In a small bowl, combine the 1 cup panko breadcrumbs with the remaining 1 cup sharp cheddar cheese and 1 tbsp dried parsley. Sprinkle this mixture evenly over the top layer. This crispy topping is what makes this casserole so special—it adds texture contrast and that satisfying crunch.

Transfer the skillet to a preheated 375°F oven and bake for 20-25 minutes until the top is deep golden brown and bubbly. You'll see the edges start to crisp up—that's your signal it's ready. The casserole should be hot throughout, with the cheese melted and the breadcrumbs perfectly toasted.

For the crispiest top, I like to broil for the last 2 minutes—watch closely so it doesn't burn. When it's done, 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.

Serving suggestions for this campbell's string bean casserole

Classic Pairings

This casserole shines as a hearty side dish for roasted meats like herb-crusted chicken or smoked pork chops. I often serve it alongside my Nonna's garlic mashed potatoes—the creamy texture of the casserole balances the richness of the potatoes perfectly.

For a complete meal, add a simple green salad with a tangy vinaigrette to cut through the richness. 🥗

Bread Basket Essentials

Nothing complements this dish like warm crusty bread or buttery dinner rolls. I grab sourdough loaves from my local Boston bakery—their crusty exterior and soft interior soak up the creamy sauce beautifully.

For extra indulgence, serve with garlic butter for dipping. If you're feeling lazy, even toasted baguette slices work in a pinch.

Dessert Balance

Since this casserole is rich and cheesy, balance it with something light and sweet. Vanilla ice cream or berry cobbler are perfect choices. I often make my grandma's apple crisp—the warm spices complement the savory flavors beautifully.

For a no-bake option, lemon bars provide a bright contrast that cleanses the palate. 🍏

Leftovers Reinvented

This casserole tastes even better the next day, so plan to make extra! Reheat leftovers in the oven at 350°F for 15-20 minutes until bubbly. For a quick lunch, serve it with crispy bacon on top and a side of pickled vegetables for acidity.

You can also turn it into casserole sliders—slice into squares, wrap in puff pastry, and bake until golden for a fun appetizer. 🍽️

Drink Pairings

A crisp white wine like Sauvignon Blanc or Chardonnay pairs beautifully with the creamy, cheesy flavors. For beer lovers, a light lager or wheat beer cuts through the richness without overpowering the dish.

I also enjoy a sparkling apple cider—its effervescence balances the richness perfectly, especially during holiday gatherings. 🍷

Holiday Twist

For Thanksgiving or Christmas, add diced ham or sausage to the bean mixture before baking. Garnish with fresh parsley and a sprinkle of smoked paprika for a festive touch.

This version becomes a star side dish that guests always ask for seconds of. Serve with roasted Brussels sprouts and honey-glazed carrots for a well-rounded holiday meal. 🎄

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