Real mushrooms and a butter-and-milk sauce leave the canned-soup version far behind. Blanch the beans, then plunge them into cold water to stop the cooking. That's what keeps them bright green and snappy through the bake rather than fading to army drab.
By Vince Gonzalez · Published July 2026 · Sourcing verified 5 Jul 2026
Prep25 min
Cook30 min
Makes8 servings
CuisineAmerican
Cost$
VegetarianGluten-free
Contains dairy
Make it vegan: use plant milk, oil, or a vegan cheese for the dairy.
The Ingredients — and where to get them
Cook for8servings
Mushrooms
Real cremini or mixed mushrooms, sliced, for the from-scratch sauce.
Blanch and shockBoil the beans 4 minutes, then dunk in ice water. The shock locks in the bright green and stops them from overcooking to mush in the oven.
Cook the mushroomsSear the mushrooms in butter until browned and their water cooks off. Driving off the liquid concentrates the flavor and keeps the sauce thick.
Build the sauceWhisk flour into the mushrooms, then stream in milk until it thickens. Season aggressively; casseroles dull flavors, so overshoot a little.
Layer and bakeFold beans into the sauce, top with fried onions, and bake at 375F until bubbling, about 20 minutes. Add the onions near the end if you want them crisp.
Can you make Green Bean Casserole in an air fryer? — Yes, with an insert
Not on its own — an air fryer can’t hold a pool of liquid. You can simmer it in an oven-safe dish or a silicone insert made to fit the basket, but the broth won’t reduce or brown the way it does on the stove, and that insert comes out scorching, so use oven mitts. For real depth, a pot on the stove wins.
Can you freeze Green Bean Casserole? — Yes
Yes — it freezes well. Cool it fully, portion into airtight containers, and it keeps a few months; thaw in the fridge and reheat gently.
Can you make Green Bean Casserole ahead of time? — Yes
Yes — it holds well and often tastes better the next day. Make it ahead and reheat gently before serving.
Is Green Bean Casserole gluten-free? — Yes
Yes — nothing in this recipe as written contains gluten. As always, glance at the labels on any packaged items (broth, sauces, chocolate), since brands vary.
Is Green Bean Casserole vegan? — Vegetarian, not vegan
It’s vegetarian but not vegan as written — it has dairy. Make it vegan: use plant milk, oil, or a vegan cheese for the dairy.
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