Side Dishes
This 1950s-style green bean casserole delivers the nostalgic comfort of French's seasoning and McCormick's cream of mushroom soup in every creamy, crunchy bite. The secret lies in perfectly sautéed onions that crisp into a golden topping, while tender green beans soak up the rich, savory sauce.
I first made this recipe when I wanted to recreate the exact texture and flavor my grandmother served at holiday dinners—it's become a family staple ever since.
The beauty of this classic dish is its simplicity: just a handful of ingredients transform into a side that's both hearty and elegant. French's seasoning adds that signature tangy depth, while the mushroom soup creates a velvety base that coats every green bean.
The key technique? Cooking the onions until they're deep golden and crispy—this is what makes the difference between good and exceptional casserole.
What you'll end up with is a dish that's warm, comforting, and perfectly balanced—creamy sauce with crispy onion topping and tender green beans underneath. The aroma alone will fill your kitchen with nostalgia, while the first bite delivers that perfect mix of textures and flavors.
This is the kind of recipe that makes dinner feel special, no matter the occasion.
Ready in just 45 minutes with minimal prep work, this casserole is perfect for holiday tables or weeknight dinners when you want something that feels like a hug in a baking dish.
The instructions are straightforward, but the results are anything but ordinary—this is comfort food at its finest, with the exact balance of ingredients that makes it unforgettable.
Ingredients for french's green bean casserole mccormick
Just twelve ingredients transform into that iconic 1950s green bean casserole you crave.
| Ingredient | Amount | Notes |
|---|---|---|
| Fresh Green Beans 🥦 | 1 ½ lb | Trimmed, cut into 2-inch pieces |
| Yellow Onions 🧅 | 2 medium | Thinly sliced for crispy topping |
| French's Fried Onion Seasoning Mix 🧅 | 1 ½ cups | Original blend for authentic flavor |
| McCormick Cream of Mushroom Soup 🍄 | 2 cans | Condensed, 10.5 oz each |
| Milk 🥛 | ½ cup | Whole milk for creaminess |
| Butter 🧈 | ½ cup | Unsalted, cubed for sautéing |
| All-Purpose Flour 🌾 | ¼ cup | For thickening sauce |
| Salt 🧂 | ½ tsp | Kosher or sea salt |
| Black Pepper 🌶️ | ¼ tsp | Freshly ground preferred |
| Garlic Cloves 🧄 | 2 cloves | Minced for extra flavor |
| Shredded Cheddar Cheese 🧀 | ½ cup | Optional for extra richness |
| Canned Mushrooms 🍄 | ½ cup | Drained, chopped for texture |
The onions are everything here. Yellow onions work best for that sweet, caramelized flavor, but red or white will do in a pinch. Slice them thin—almost translucent—and cook them low and slow until they're deep golden. Trader Joe's has the best pre-sliced onions for this, but if you're cutting your own, take your time. The French's seasoning mix is non-negotiable for that nostalgic tang. Grab the original blend—none of that 'low-sodium' nonsense. The McCormick soup? Stick with the canned version for this recipe. The boxed powdered stuff just doesn't cut it.
No French's seasoning? Mix 1 tsp onion powder, 1 tsp garlic powder, 1 tsp dried parsley, and ½ tsp salt—it won't be identical, but it'll work. Running low on milk? Half-and-half or light cream gives the same richness. The butter matters—unsalted so you control the saltiness. If you're feeling fancy, add a splash of white wine or chicken broth to the sauce for extra depth. And if you're worried about the texture, the canned mushrooms add a nice chunkiness that balances the creamy sauce.
This casserole reheats beautifully—just cover it with foil and bake at 350°F for 20 minutes. The onion topping stays crispy if you reheat it uncovered for the last 5 minutes. Keeps in the fridge for 4-5 days, freezes for 3 months. I always make a double batch—one for dinner, one for leftovers that taste even better the next day. The secret to freezing? Let it cool completely, then cover the dish tightly with plastic wrap before sealing with foil.
Why You'll Love This Recipe
- One-Pan Magic: I swear by this recipe because it’s literally one pan, one bowl, and done. Trim the beans, sauté the onions, dump in the soup and milk, then top with those crispy fried onions—no extra dishes, no fuss. My weeknights thank me every time.
- Creamy Crunch Perfection: That creamy mushroom soup base with the crunch of French’s seasoning? It’s the kind of contrast that makes you pause mid-bite. The onions caramelize just enough to add depth, while the fried onion topping delivers that addictive texture. Honestly, it’s the only green bean dish I’ll make now.
- Crowd-Pleaser Every Time: This is my go-to for holidays, potlucks, or when my in-laws visit. It’s familiar enough for the skeptics but feels special enough to impress. Plus, the leftovers reheat like a dream—just add a splash of milk to keep it creamy.
- Budget-Friendly Staples: Fresh green beans are cheap, soup mixes last forever, and milk stretches the recipe into a full meal. Between us, I’ve made this for under $5 per serving, and it still feels like a restaurant-worthy dish. That’s the kind of value I’ll always choose.
Step-by-step instructions for French's green bean casserole
This classic dish delivers that nostalgic comfort in just a few simple steps.
Prep and Blanch the Green Beans
Start by trimming the ends off the 1.5 lb of fresh green beans and cutting them into 2-inch pieces. Spread them out on a baking sheet and steam them for 3-4 minutes until they're bright green and just tender—you want them to stay crisp but not mushy. Drain them immediately and set aside.
While the beans cook, thinly slice one of the 2 medium yellow onions. You'll use these for both the topping and the sauce later. The thin slices will crisp up perfectly when baked, giving that iconic crunch everyone loves.
Make the Creamy Mushroom Sauce
In a large skillet, melt the 0.5 cup of butter over medium heat. Add the 2 minced garlic cloves and cook for 30 seconds until fragrant. Stir in the 0.25 cup all-purpose flour and cook for 1-2 minutes until it forms a light roux.
Slowly pour in the 0.5 cup milk while whisking constantly to prevent lumps. Add the 2 cans of McCormick cream of mushroom soup and the 0.5 cup drained, chopped canned mushrooms. Bring to a gentle simmer for 3-4 minutes until thickened. Stir in the 0.5 tsp salt and 0.25 tsp black pepper.
Assemble the Casserole
Preheat your oven to 350°F. In a 9x13-inch baking dish, spread the blanched green beans in an even layer. Pour the creamy mushroom mixture over the top, making sure everything is well coated. Sprinkle the 0.5 cup shredded cheddar cheese evenly over the surface.
Here's the secret to that perfect crunchy topping: spread the remaining thinly sliced yellow onion pieces evenly over the cheese. Then sprinkle the 1.5 cups of French's fried onion seasoning mix on top. The onions will crisp up beautifully while the cheese melts into a gooey blanket.
Bake to Golden Perfection
Bake uncovered for 25-30 minutes until the top is golden brown and bubbly. The onions should be crispy while the cheese forms a delicious, melty layer. If the top starts browning too quickly, tent loosely with foil for the last 5-10 minutes.
Let the casserole rest for 10 minutes before serving. This resting time lets the flavors meld together and makes it easier to scoop out perfect portions. The combination of crispy onions, creamy mushroom sauce, and tender green beans makes every bite comforting and delicious.
Pro Tips For Making French'S Green Bean Casserole Mccormick
- Trim and Blanch Beans: Skip the soggy texture by cutting beans into 2-inch pieces and blanching them for 3 minutes before mixing with the soup. I learned this the hard way—raw beans release water and turn the casserole into a sad, watery mess. The blanch also brightens their color and keeps them crisp-tender.
- Sauté Onions Low and Slow: Cook the onions in butter over medium-low heat until they’re translucent but not browned—about 8-10 minutes. My grandmother swore by this, and she was right: caramelized onions make the dish richer, but burnt ones turn the whole casserole bitter. (Yes, even if you’re impatient like me.)
- Mix Onion Seasoning Last: Stir in the French’s Fried Onion Seasoning Mix after the casserole comes out of the oven, while it’s still hot. Sprinkling it earlier makes the onions clump and lose their crunch. This isn’t the prettiest method, but it’s the tastiest—like a crispy surprise in every bite.
- Stir in Extra Milk: Add 2-3 extra tablespoons of milk when mixing the soup to loosen the sauce. The recipe often feels too thick, and thin soup = bland casserole. I was skeptical until I tried it—now I double-check the consistency before baking.
Essential equipment for perfect results
Must-Have Baking Dish
You'll need a 9x13-inch baking dish for this recipe—it's the perfect size for even baking and crispy onion topping. I recommend using ceramic or glass (like Pyrex) because they distribute heat evenly and prevent hot spots.
Avoid dark-colored metal pans—they can make the onions burn before the center cooks through. If you're short on space, a 9x13-inch stoneware dish works beautifully too. 🧑🍳
Precision Thermometer
A good instant-read thermometer is worth its weight in gold for this casserole. The ideal internal temperature when done is 165°F—this ensures the green beans are fully cooked while the cheese stays creamy.
I use a Thermoworks Thermapen because it's fast and accurate, but even a budget Oster digital thermometer will work. Stick it into the center of the casserole before serving to check doneness. 🌡️
Skillet for Sauce
For the creamy mushroom sauce, a heavy-bottomed skillet (like All-Clad or Lodge cast iron) prevents scorching and helps create a smooth, lump-free roux. If you don't have one, a stainless steel saucepan works fine—just keep the heat at medium-low to avoid burning the garlic or flour.
A whisk is essential for blending the milk into the roux smoothly. 🥄
Onion Slicer Tool
Thin, even onion slices are key for that perfect crispy topping. A mandoline slicer (like OXO Good Grips) makes this effortless—just set it to 1/16-inch thickness. If you don't have one, use a sharp chef's knife and slice carefully, holding the knife at a 30-degree angle for consistency.
The thinner the slices, the crispier they'll get when baked. 🧅
Mixing Bowls Set
You'll need two medium mixing bowls—one for blanching the green beans (with a colander) and another for assembling the casserole toppings. I prefer stainless steel or glass because they're easy to clean and don't retain odors.
A slotted spoon helps drain the beans without losing too much water. Keep everything within arm's reach to streamline the process. ✨
Optional: Food Processor
For extra convenience, a mini food processor (like Cuisinart DLC-12BC) can quickly chop the canned mushrooms into small, even pieces. If you're skipping the mushrooms, this tool isn't necessary—but it's a game-changer for anyone who hates chopping by hand. Just pulse for 3-4 seconds until finely diced. 🍄
Nutrition facts
Frequently asked questions
Can I use frozen green beans instead of fresh?
Frozen beans work perfectly—just thaw and drain them well before using. For extra flavor, blanch them for 2 minutes to crisp them up. The texture difference is minimal when baked in the creamy sauce.
Why does my onion topping get soggy?
Soggy onions usually mean the casserole was overbaked or the onions weren't cooked enough first. For crispy results, sauté the onions in butter until golden brown before baking. Also, bake uncovered and tent only if needed—moisture is the enemy of crunch!
Can I make this ahead for holiday dinners?
This casserole actually tastes better the next day! Assemble it up to 24 hours ahead and refrigerate. Add 10-15 minutes to baking time if cold. For freezing, bake completely, cool, then freeze for up to 3 months. Reheat covered at 350°F for 20 minutes.
What's the secret to the creamiest sauce?
The roux is everything! Cook the butter, garlic, and flour until golden (not brown) before adding milk. For extra richness, whisk in 2 tablespoons of sour cream at the end. The McCormick soup already adds creaminess, but this tweak makes it velvety.
Can I substitute the French's seasoning?
Yes, but the flavor won't be identical. Mix 1 tsp onion powder, 1 tsp garlic powder, 1 tsp dried parsley, and ½ tsp salt. For extra tang, add ½ tsp lemon zest. The seasoning adds depth that's hard to replicate—it's worth tracking down the original blend!