Green Bean Casserole
A timeless American comfort food featuring tender green beans bathed in a creamy mushroom sauce, topped with crispy fried onions. This classic holiday side dish comes together in one baking dish and fills the kitchen with a warm, savory aroma that signals home.
For 4 servings
- prep · ~8 min
Preheat the oven and blanch the green beans.
1.Preheat oven to 375°F (190°C).2.Bring a large pot of salted water to a rolling boil.3.Add green beans and blanch for 4 minutes until bright green and tender-crisp.4.Drain immediately and plunge into a bowl of ice water to stop cooking. Drain again and set aside.TIPThe ice bath locks in the vibrant green color and keeps beans from overcooking. - saute · ~10 min
Sauté the mushrooms and aromatics.
1.Melt butter in a large skillet over medium heat.2.Add diced onion and cook until softened and translucent (3-4 min).3.Add sliced mushrooms and minced garlic; sauté until mushrooms release their liquid and begin to brown (5-6 min).TIPDon't crowd the pan — letting mushrooms breathe helps them brown instead of steam. - saute · ~7 min
Build the creamy mushroom sauce.
1.Sprinkle flour over the mushroom mixture and stir constantly for 1 minute to cook out the raw flour taste.2.Slowly pour in milk and cream while whisking to avoid lumps.3.Add soy sauce, salt, and black pepper.4.Simmer, stirring frequently, until the sauce thickens enough to coat the back of a spoon (3-4 min).TIPWhisk continuously when adding milk — this prevents lumps and gives you a silky sauce. - mix · ~2 min
Combine beans and sauce.
1.Remove skillet from heat.2.Add the blanched green beans and half of the fried onions to the sauce.3.Fold gently until beans are evenly coated. - assemble · ~1 min
Transfer to baking dish and top.
1.Pour the green bean mixture into the baking dish and spread evenly.2.Sprinkle the remaining fried onions over the top in an even layer. - bake · ~30 min
Bake until golden and bubbly.
Bake for 25-30 minutes, or until the sauce is bubbling around the edges and the fried onion topping is deep golden brown.
TIPIf onions brown too quickly, tent loosely with foil for the last 10 minutes. - rest · ~5 min
Let the casserole rest before serving.
Remove from oven and let stand for 5 minutes. The sauce will continue to set as it cools slightly.
TIPResting makes the casserole easier to serve and brings the flavors together.
What to keep in mind.
6 tips from the recipe — small details that make a real difference to the final dish.
- 1Blanch the green beans and immediately shock them in an ice bath to lock in their bright color and crisp texture.
- 2Let the mushrooms release their liquid and start to brown in the pan before adding flour — this deepens the savory flavor.
- 3Whisk continuously while adding the milk and cream to the roux to prevent lumps and ensure a silky sauce.
- 4Fold the green beans gently into the sauce to avoid breaking the beans and keep the casserole tidy.
- 5If the fried onion topping browns too quickly during baking, tent the dish loosely with foil for the last 10 minutes.
- 6Let the casserole rest for 5 minutes after baking — the sauce will thicken further and make serving much easier.
Adapt it for your goals.
Vegetarian version
This recipe is already vegetarian. Replace the cream with an extra 1/4 cup whole milk for a lighter sauce, and use a vegetarian Worcestershire sauce instead of soy sauce for a different depth.
gluten free optionGluten-free option
Substitute the all-purpose flour with a gluten-free all-purpose blend or cornstarch slurry (1 tbsp cornstarch mixed with 2 tbsp cold water) to thicken the sauce. Use certified gluten-free fried onions on top.
low oil variationLow-oil variation
Reduce the butter to 1 tbsp and sauté the mushrooms in a non-stick pan with a splash of water or vegetable broth. Use a lighter hand with the fried onion topping to cut down on oil without losing the crunchy finish.
Why this is on our healthy list.
Rich in Antioxidants
Green beans provide vitamin C and beta-carotene, while mushrooms offer selenium and ergothioneine, all of which help fight oxidative stress.
Good Source of Fiber
Green beans and mushrooms both contribute dietary fiber, supporting healthy digestion and steady blood sugar levels.
Contains Immune-Supporting Nutrients
Garlic and mushrooms are known for their natural compounds that may support the immune system, including beta-glucans in mushrooms and allicin in garlic.
Calcium from Dairy
The milk and heavy cream in the sauce provide calcium, which is important for bone health.
Frequently asked questions
Yes, use frozen cut green beans and skip the blanching — just thaw them and pat dry, then add directly to the sauce.
