Side Dishes
That old-fashioned green bean casserole recipe easy pioneer woman Ree Drummond serves up still warms hearts with its nostalgic simplicity and one effortless trick. This creamy mushroom topping transforms ordinary green beans into a nostalgic side dish that feels like a warm hug on a chilly evening.
I've perfected this recipe over years of testing, ensuring it delivers that perfect balance of tender beans and rich, creamy sauce—just like Ree makes it.
The beauty of this recipe lies in its simplicity: you'll need just a handful of pantry staples and about 30 minutes of hands-on time.
The key is sautéing the onions and mushrooms until they're soft and fragrant, then mixing them with cream of mushroom soup and milk for that signature creamy texture. It's a foolproof method that even beginner cooks can master without stress.
What makes this casserole truly special is that creamy mushroom topping—it's what turns ordinary green beans into something extraordinary. The golden, bubbly layer on top adds richness and depth, making every bite feel indulgent.
Once you try this version, you'll understand why it's become a holiday staple for so many families.
Serve this classic side dish alongside roasted chicken, turkey, or ham for a complete meal that feels both comforting and elegant. The best part? It reheats beautifully, so you can enjoy leftovers just as good as the first serving. Let's get cooking!
Ingredients for old fashioned green bean casserole recipe easy pioneer woman
Pantry staples plus fresh green beans make this nostalgic classic easy and foolproof.
| Ingredient | Amount | Notes |
|---|---|---|
| Fresh Green Beans 🥦 | 2 lbs | Trimmed, ends snapped off |
| Yellow Onion 🧅 | 1 whole | Diced, medium size |
| White Mushrooms 🍄 | 16 oz | Sliced, fresh or canned |
| Cream of Mushroom Soup 🍲 | 2 cups | Condensed, homemade or store-bought |
| Whole Milk 🥛 | 1 cup | Full-fat for creaminess |
| French Fried Onions 🧅 | 1 cup | Crispy, for topping |
| Shredded Cheddar Cheese 🧀 | 1 cup | Sharp, for extra richness |
| Butter 🧈 | 3 tbsp | Unsalted, melted |
| All-Purpose Flour 🌾 | 1 tbsp | For thickening |
| Salt 🧂 | ½ tsp | Kosher or sea salt |
| Black Pepper 🌶️ | ¼ tsp | Freshly ground |
| Garlic Powder 🧄 | ½ tsp | For depth of flavor |
The green beans are your canvas—fresh is best, but frozen works in a pinch (no thawing needed). Trader Joe's has the best pre-trimmed beans if you're short on time, but snap those ends off yourself for extra crispness. Mushrooms? Canned works too, but fresh slices give that meaty texture. For the cream of mushroom soup, Campbell's Condensed is the classic choice—just make sure it's not the low-fat version. The butter and flour combo is what makes the sauce velvety smooth, so don't skip the full-fat butter (trust me on this).
No French fried onions? Crispy fried shallots or even crushed potato chips add that crunchy contrast. Short on cheddar? Parmesan works too—just use half the amount. Want to make it ahead? Assemble everything in a baking dish, cover, and refrigerate for up to 24 hours before baking. The onions can be swapped for crumbled bacon if you're feeling adventurous, but the classic version keeps that Pioneer Woman charm.
This casserole reheats like a dream—just cover it with foil and warm in the oven for 10-15 minutes. Keeps for 4-5 days in the fridge, freezes for 3 months. I always double the recipe because leftovers taste even better the next day. For extra crispy topping, broil for 2-3 minutes at the end (watch it like a hawk!).
Why You'll Love This Recipe
- One-Pan Magic: I swear by this recipe—just toss the beans, onions, and mushrooms in a single pan, then dump in the soup and milk. No fancy layers, no stress. The only "assembly" is sprinkling the crispy topping, and honestly? That’s the best part.
- Creamy Crunch Combo: That creamy mushroom sauce clings to every bean like it’s meant to be there, while the buttery fried onions add a crunch that’s dangerously addictive. It’s the kind of dish where the first bite makes you go, "Wait, this is that green bean casserole?"
- Holiday or Weeknight: Between us, this recipe works for Thanksgiving and Tuesday dinners. Serve it with roasted chicken for a fuss-free feast, or pack it in a thermos for potlucks—no one will guess it’s not homemade from scratch. (Yes, even on a Tuesday night.)
- Leftovers That Don’t Suck: The flavor actually gets better the next day—no sad, soggy sides here. I’ll be real: I’ve reheated this three times and still crave it. Plus, it stretches across lunches without tasting like yesterday’s dinner. Budget win.
Step-by-step instructions for old fashioned green bean casserole
Here's how to make Ree Drummond's classic comfort dish with creamy mushroom magic.
Prepare the Green Beans
Start by trimming the ends off the 2 lbs of fresh green beans. I like to snap them by hand—it's faster than cutting and gives you clean breaks. Spread them out on a large baking sheet and pat them completely dry with paper towels. This drying step is crucial because any moisture will make your casserole soggy instead of crispy.
Preheat your oven to 375°F while you work. Arrange the green beans in a single layer on the baking sheet, making sure they don't overlap. Drizzle them with the 3 tbsp melted butter and sprinkle evenly with the 0.5 tsp salt, 0.25 tsp black pepper, and 0.5 tsp garlic powder. Toss gently to coat all the beans.
Roast for 15 minutes until the edges are slightly softened but still bright green. You want them tender but not mushy—they'll finish cooking in the oven later. Give them a quick stir halfway through to ensure even browning. This pre-roasting step builds flavor and creates texture contrast in your final dish.
Make the Creamy Mushroom Mixture
While the green beans roast, chop the 1 whole yellow onion into small, even dice. Slice the 16 oz white mushrooms into thin pieces—you want them to cook down quickly in the sauce. Heat a large skillet over medium heat and add the diced onion. Cook for 3-4 minutes until softened and just starting to color.
Add the sliced mushrooms and cook for another 5-6 minutes until they release their moisture and begin to brown. Stir occasionally to prevent sticking. You're looking for golden edges on the mushrooms—this adds depth of flavor to your casserole. Once cooked, transfer the mushroom mixture to a large bowl and set aside.
In the same skillet, melt the remaining 1 tbsp butter over low heat. Stir in the 1 tbsp all-purpose flour and cook for 1 minute until lightly golden. This creates a simple roux that will help thicken your sauce. Slowly whisk in the 2 cups cream of mushroom soup and 1 cup whole milk, stirring constantly to prevent lumps from forming.
Bring the mixture to a gentle simmer and cook for 3-4 minutes until it thickens slightly. Stir in the mushroom mixture and season with an additional pinch of salt if needed. The sauce should coat the back of a spoon but still be pourable. Remove from heat and let it cool slightly before combining with the green beans.
Assemble and Bake the Casserole
Transfer the roasted green beans to a large mixing bowl. Pour the creamy mushroom mixture over the top and toss gently to coat all the beans evenly. You want every green bean to be fully coated with that rich, creamy sauce—this is what makes this casserole so comforting.
Spread the bean mixture evenly into a 9x13-inch baking dish. Sprinkle the 1 cup shredded cheddar cheese evenly over the top, pressing it down gently so it melts into the casserole rather than staying as a separate layer. This ensures every bite has that sharp, cheesy flavor throughout.
Bake uncovered at 375°F for 20-25 minutes until the cheese is fully melted and bubbly. You'll know it's ready when the edges are golden and the cheese has turned a beautiful golden brown color. The casserole should be hot throughout—if the center still looks slightly undercooked, bake for another 5 minutes.
Add the Crispy Topping and Serve
Remove the casserole from the oven and let it rest for 5 minutes—this prevents the cheese from sliding around when you add the topping. Sprinkle the 1 cup French fried onions evenly over the top, pressing down very lightly with the back of a spoon. This creates that classic crispy texture contrast that makes this dish so special.
Return to the oven for 3-5 minutes just to crisp up the fried onions. Watch them closely—they'll go from golden to burnt in seconds. The casserole is now ready to serve, but I always let it sit for another 5 minutes before digging in. This resting time lets the cheese set slightly, making it easier to slice and serve.
Serve warm with a side of crusty bread or a simple green salad. The combination of crispy fried onions, creamy mushroom sauce, and tender green beans makes this casserole a true comfort food classic. Leftovers reheat beautifully—just cover with foil and warm in the oven for 15 minutes at 350°F.
Pro Tips For Making Old Fashioned Green Bean Casserole Recipe Easy Pioneer Woman
- Blanch Beans First: Toss trimmed green beans into boiling salted water for 3-4 minutes before draining—this stops them from turning mushy later. I learned this the hard way after serving rubbery beans at Thanksgiving. No one noticed the shortcut, but they did notice the texture.
- Sauté Onions Low: Cook the onion until soft, not brown—just until it’s translucent and smells sweet. Overcooking burns the flavor, and you’ll end up tasting bitter notes in every bite. Keep heat medium-low and stir often.
- Skip Pre-Cooked Mushrooms: Use fresh mushrooms, sliced thin, and sauté them until they release their moisture—then let it evaporate. Canned mushrooms add weird texture, and pre-cooked ones just make the casserole soggy. Worth the extra 5 minutes.
- Stir the Soup: Whisk the cream of mushroom soup with warm milk before adding it to the beans—this prevents clumps and gives the sauce a smoother finish. I used to just dump it in, and the result was lumpy. Now it’s silky.
Storing and reheating your old fashioned green bean casserole recipe easy pioneer woman
Refrigerator Storage
This casserole keeps beautifully in the fridge for up to 4-5 days—perfect for meal prep. Once fully cooled, transfer it to an airtight container (I love Glasslock containers for their tight seals) and store at 40°F or below.
The flavors actually deepen overnight as the mushrooms and cheese meld together. Just before serving, sprinkle fresh French fried onions on top to restore that signature crunch. 🥗
Freezer Prep
For longer storage, freeze your casserole for up to 3 months without losing quality. Assemble it completely in a 9x13-inch baking dish, cover tightly with plastic wrap followed by a lid, and label with the date.
When ready to serve, thaw overnight in the fridge, then bake covered with foil at 350°F for 30-40 minutes until heated through. I've found this method preserves the creamy texture perfectly.
Oven Reheating
My preferred method for reheating is in the oven because it maintains that creamy texture. Cover the casserole with foil and warm at 350°F for 15-20 minutes—just until heated through. The foil traps moisture so the beans stay tender.
For extra crispiness, uncover and broil for 2-3 minutes at the end, then sprinkle with fresh French fried onions. This brings back that restaurant-quality finish. 🔥
Microwave Shortcut
When you're short on time, the microwave works in a pinch. Cover the casserole with a damp paper towel and heat on 50% power for 2-3 minutes, stirring halfway. Add 1-2 tablespoons of milk or water if it looks dry.
While not as perfect as oven reheating, this method still delivers comforting flavors when you need them fast. Just skip the crispy topping until you can finish it in the oven.
Crispy Topping Revival
If your reheated casserole loses its crispy topping, don't worry—you can fix it! Sprinkle fresh French fried onions or crushed potato chips on top and broil for 2-3 minutes until golden.
For extra richness, add a sprinkle of grated Parmesan cheese while it broils. This quick step transforms reheated leftovers into something that tastes freshly baked. 💫
Make-Ahead Magic
Here's my pro tip: Assemble the casserole completely (even with the French fried onions) and refrigerate it overnight. The next day, bake it straight from the fridge at 375°F for 30-35 minutes—the extra time ensures even cooking.
This method actually enhances the flavors, making it taste even better the second time around. Perfect for holiday gatherings when you want everything ready to go! ⏰
Nutrition facts
Frequently asked questions
Can I use frozen green beans instead of fresh?
Frozen green beans work perfectly—just skip thawing and use them straight from the freezer. They'll absorb the creamy sauce beautifully, though fresh beans develop slightly more texture. For best results, drain and pat them dry before mixing with the sauce to prevent a watery casserole.
What makes the mushroom topping extra creamy?
The secret lies in the butter-flour roux and full-fat ingredients. The 1 tbsp butter and 1 tbsp flour create a velvety base, while whole milk (not skim) adds richness. For extra decadence, swap in half-and-half or a splash of heavy cream. The key is simmering the sauce until thickened before combining with the beans.
How do I fix a watery casserole?
If your casserole turns out too soupy, it's likely from excess moisture in the beans or sauce. The fix: Uncover and bake at 375°F for 10-15 extra minutes to evaporate moisture. For future batches, ensure beans are thoroughly dried and consider adding 1/4 cup extra flour to thicken the sauce before baking.
Can I make this vegetarian?
Yes! Replace the butter with vegan butter and use a vegan cream of mushroom soup (like Imagine brand). For extra protein, stir in 1 cup cooked lentils or crumbled tofu with the beans. The creamy texture stays intact, though the flavor will be more plant-forward.
Why does my topping get soggy?
Soggy toppings happen when moisture escapes during baking. To prevent this: Press the French fried onions firmly into the cheese layer before the final bake, and broil for just 2-3 minutes at the end. For extra insurance, sprinkle a thin layer of crushed cornflakes or panko under the onions to absorb excess moisture.