Side Dishes
This McCormick Green Bean Casserole delivers the comforting, nostalgic flavors of a classic holiday side dish with a crispy golden top and creamy mushroom sauce that’s impossible to resist.
The secret lies in layering tender green beans with a rich, velvety mushroom mixture and finishing with a crunchy fried onion topping—just like Grandma used to make.
I’ve perfected this recipe over years of holiday gatherings, ensuring every bite brings back those warm, cozy memories while still being approachable for weeknight dinners.
The foundation of this dish starts with McCormick’s signature seasoning blend, which infuses the green beans with just the right balance of savory and tangy notes. A simple mushroom cream sauce—made with cream of mushroom soup, sour cream, and a touch of garlic—binds everything together, creating that signature creamy texture.
The key to success is baking it at the right temperature (375°F) for about 45 minutes, allowing the top to crisp up beautifully while keeping the center warm and tender.
What makes this casserole truly special is the contrast of textures: the crispy fried onion topping adds a satisfying crunch, while the creamy mushroom sauce and tender green beans provide a hearty, comforting bite.
It’s the kind of dish that disappears quickly at holiday tables but also works perfectly as a side for everyday meals. The best part? It’s easy to customize—swap the fried onions for a gluten-free alternative or use vegan cream cheese for a plant-based version without sacrificing flavor.
Whether you're serving it at Thanksgiving or pulling it out for a casual family dinner, this McCormick Green Bean Casserole is a crowd-pleaser that brings comfort and tradition to every table. Ready to recreate this holiday classic in your own kitchen? Let’s get started with the full recipe.
Ingredients for mccormick green bean casserole
Six ingredients bring back holiday magic—crispy top, creamy sauce, and tender green beans.
| Ingredient | Amount | Notes |
|---|---|---|
| Fresh Green Beans 🍃 | 2 lb | Trimmed, cut into 2-inch pieces |
| McCormick Green Bean Seasoning Mix 🌶️ | 2 tbsp | Follow package instructions for prep |
| Cream of Mushroom Soup 🍄 | 2 cups | Condensed, unsalted preferred |
| Sour Cream 🥛 | ½ cup | Full-fat for best texture |
| Mushrooms, Sliced 🍄 | 1 cup | White or cremini, finely chopped |
| Garlic Cloves 🧄 | 3 cloves | Minced, for deep flavor |
| Fried Onions, Topping 🧅 | 1 ½ cups | Crispy, store-bought or homemade |
| Milk 🥛 | ¼ cup | Whole milk for creaminess |
| Butter 🧈 | 2 tbsp | Unsalted, melted |
| Salt 🧂 | ½ tsp | Diamond Crystal preferred |
| Black Pepper 🌶️ | ¼ tsp | Freshly ground for best flavor |
| All-Purpose Flour 🌾 | 1 tbsp | For thickening sauce |
| Shredded Cheddar Cheese 🧀 | ½ cup | Optional, for extra richness |
The McCormick seasoning mix is non-negotiable here—it’s what gives that classic tangy kick. Grab the 1.5 oz jar from any grocery store’s spice aisle (it’s usually near the canned soups). For the green beans, fresh is best—the crisp-tender texture matters. If you’re short on time, frozen green beans work too, just thaw and drain them first. The mushrooms? Cremini adds more earthiness than white, but either works. I always buy pre-sliced mushrooms from the salad bar section at Trader Joe’s—saves chopping time.
No cream of mushroom soup? Mix 2 cups chicken broth with 1/4 cup heavy cream and 1 tbsp mushroom powder (the kind in tiny jars). Sour cream can be swapped for Greek yogurt if you’re watching fat, but it’ll be tangier. Fried onions giving you trouble? Crushed potato chips (like Ruffles) make a decent crunchy substitute in a pinch. The cheddar cheese is totally optional, but if you add it, use sharp cheddar—it melts better. For a vegan version, swap the sour cream for cashew cream and use vegan butter.
This casserole reheats like a dream—375°F for 15-20 minutes until bubbly. Store leftovers in an airtight container for up to 4 days in the fridge. Freezes beautifully for 3 months—just bake straight from frozen at 375°F for 55-60 minutes. Pro tip: Assemble it the night before and refrigerate uncovered for the flavors to meld. The top will crisp up even more after baking the next day—worth the wait.
Why You'll Love This Recipe
- One-Pan Magic: Honestly, I swear by this—just toss the green beans, mushrooms, and seasoning mix into one pan, then dump in the soup and sour cream. No chopping, no fuss, and zero dishes beyond the pan itself.
- Creamy Crunch Perfection: That crispy fried onion topping with the creamy mushroom sauce? It’s the kind of combo that makes you go back for thirds. The McCormick seasoning adds this warm, herby depth that cuts through the richness.
- Potluck Star: Between us, this is the dish I always bring to gatherings. It reheats beautifully, fits in any serving dish, and even my picky uncle asks for seconds. Plus, it’s the one side that never gets leftovers—because it disappears fast.
- Budget-Friendly Feast: Fresh green beans might seem pricier, but you’re getting a full serving for under $3 per person. The seasoning mix and canned soup stretch it further, and the leftovers? Just as good cold the next day for lunch.
Step-by-step instructions for Mccormick green bean casserole
Here's how to build the perfect casserole with that signature crispy topping and velvety mushroom sauce.
Prep and Blanch the Green Beans
Start by trimming the ends off the 2 lb fresh green beans and cutting them into 2-inch pieces. Spread them out on a baking sheet and steam or boil for exactly 4 minutes until bright green and just tender. Drain immediately and plunge into ice water to stop the cooking process. This keeps them vibrant and prevents mushiness in the final dish.
Drain again thoroughly and transfer to a large mixing bowl. Sprinkle with the 2 tbsp McCormick green bean seasoning mix and toss gently with your hands or a silicone spatula. The seasoning should coat each bean evenly. Let them sit while you prepare the sauce - this gives the flavors time to meld slightly before baking.
Build the Creamy Mushroom Sauce
In a medium saucepan, melt the 2 tbsp butter over medium heat. Add the 1 cup sliced mushrooms and cook for 5-6 minutes until they release their moisture and begin to soften. Stir in the 3 cloves minced garlic and cook for 30 seconds until fragrant - don't let it brown or it'll turn bitter.
Pour in the 2 cups cream of mushroom soup and stir until smooth. Gradually whisk in the 0.25 cup milk and 1 tbsp all-purpose flour to create a thickening slurry. Bring to a gentle simmer and cook for 3-4 minutes until the sauce thickens slightly. Remove from heat and stir in the 0.5 cup sour cream, 0.5 tsp salt, and 0.25 tsp black pepper. The sauce should be creamy but still pourable - if it's too thick, whisk in 1-2 tablespoons of water.
Assemble the Casserole
Preheat your oven to 375°F. Grease a 9x13-inch baking dish with butter or cooking spray. Spread the seasoned green beans evenly in the bottom of the dish, creating a single layer. Pour the mushroom sauce evenly over the green beans, spreading it with a spatula to ensure complete coverage.
For that signature crispy topping, sprinkle the 1.5 cups fried onions evenly over the sauce. The onions should be distributed in an even layer - press down gently with the back of a spoon to help them adhere. If using, sprinkle the 0.5 cup shredded cheddar cheese evenly over the top. The cheese will melt into the onions, creating an extra-rich topping.
Bake to Golden Perfection
Bake uncovered for 30-35 minutes until the top is golden brown and bubbly, and the edges are crispy. You'll know it's done when the onions turn a deep golden color and the sauce begins to set slightly. If the top browns too quickly, tent loosely with foil for the last 10 minutes of baking.
Let the casserole rest for 10 minutes before serving - this allows the juices to redistribute and the topping to set properly. The internal temperature should reach 165°F. Serve warm with crusty bread or as a side dish for your favorite main course. The contrast of crispy topping with creamy sauce and tender green beans makes this a classic for a reason.
Pro Tips For Making Mccormick Green Bean Casserole
- Blanch Beans First: Fresh green beans need a quick 3-minute blanch in boiling water before draining and shocking in ice water—this stops the cooking and keeps them crisp. I learned this the hard way when my beans turned to mush under the soup’s heat, no matter how gently I baked it.
- Sauté Mushrooms Dry: Skip the oil for the mushrooms—just toss them in a hot skillet and let them brown for 5-6 minutes. The moisture from the mushrooms creates its own steam, and you’ll get that deep, savory flavor without worrying about grease. (Yes, even if you’re impatient like me.)
- Mix Sour Cream Last: Stir the sour cream into the soup mixture right before adding it to the beans—otherwise, it’ll curdle under the heat. I used to add it early, and the casserole always ended up with a weird, lumpy texture. Now it’s silky every time.
- Top with Crumbs Early: Sprinkle the buttery breadcrumb topping before the final 10 minutes of baking, not after. The heat will toast it perfectly while the beans finish steaming, giving you that golden, crispy finish without waiting for a separate broil. (Your future self will thank you.)
Serving suggestions for this dish
Classic Holiday Plating
Serve this casserole family-style in its 9x13-inch baking dish straight from the oven for that comforting, nostalgic presentation. Use a large serving spoon to scoop up generous portions of crispy onions and creamy sauce together.
I like to place a warm dinner roll on the side for soaking up any extra mushroom sauce—it’s a crowd-pleaser at Thanksgiving tables. 🍽️
Crispy Top Presentation
For an elevated look, transfer the baked casserole to a wooden cutting board and sprinkle with an extra ¼ cup fried onions right before serving. This adds a pop of color and ensures every bite has that satisfying crunch.
If you’re feeling fancy, garnish with fresh parsley for a bright contrast against the golden topping. Serve immediately while the onions are still crisp!
Bread Pairings
This casserole pairs perfectly with crusty sourdough, garlic bread, or baguette slices. For a heartier meal, serve alongside roasted turkey, ham, or meatloaf.
I also love pairing it with mashed potatoes or cornbread for a Southern-style feast. The bread helps balance the richness of the creamy sauce.
Make-Ahead Serving
Assemble the casserole the night before and refrigerate uncovered. This allows the flavors to meld and the top to crisp up even more when baked the next day. Bake straight from the fridge at 375°F for 45-50 minutes—no need to thaw!
This is a game-changer for holiday hosting, as it frees up oven space on the big day. 💡
Portion Control Tips
For individual servings, use a cookie scoop to portion the casserole into ramekins or small baking dishes. Bake these at 350°F for 20-25 minutes until bubbly. This works great for meal prep—store in airtight containers and reheat covered for 10-15 minutes at 350°F. Perfect for lunches or quick dinners!
Dietary Adaptations
For gluten-free guests, swap fried onions for crushed gluten-free crackers or toasted panko. To make it vegan, use cashew cream instead of sour cream and vegan butter in the sauce. The flavor stays rich and satisfying—no one will miss the dairy! Label these variations clearly for your guests. 🌱
Nutrition facts
Frequently asked questions
Can I use frozen green beans instead of fresh?
Frozen green beans work perfectly—just thaw and drain them thoroughly before using. For extra crisp-tender texture, blanch them for 2-3 minutes in boiling water, then shock in ice water before mixing with the seasoning. The key is removing all excess moisture so the sauce doesn't turn watery during baking.
Why did my casserole turn out soggy instead of crispy?
Soggy topping usually means one of two things: either the oven wasn't hot enough (375°F is critical) or the casserole wasn't baked long enough. Try pre-baking the onions on a separate sheet for 5 minutes at 400°F before assembling, or bake uncovered for 5-10 minutes longer to crisp the top. Also ensure your baking dish is properly greased.
What's the secret to making this dish ahead of time?
Assemble the casserole completely (including the fried onion topping) and refrigerate it uncovered for 12-24 hours before baking. The flavors meld beautifully, and the top crisps up even more when baked straight from the fridge. For best results, bake at 375°F for 45-50 minutes—no thawing needed! This is a game-changer for holiday hosting.
Can I make this gluten-free or vegan?
Yes! For gluten-free, replace fried onions with crushed gluten-free crackers or toasted panko. For vegan, swap the sour cream for cashew cream and use vegan butter in the sauce. The texture stays rich and satisfying—just label it clearly for your guests. The flavor won't be compromised!
How do I reheat leftovers without drying them out?
Cover the casserole with foil and reheat at 350°F for 15-20 minutes until bubbly. For individual portions, microwave covered for 1-2 minutes on high, then uncover and microwave 30 seconds more to revive the crispy topping. Add a splash of milk or broth if it seems dry.