Imen Alton Brown Green Bean Casserole Recipe is a classic American Thanksgiving side dish. This version uses fresh beans, whole milk, and a homemade mushroom sauce topped with crispy fried onions and panko breadcrumbs.
If you do nothing else, boil the beans in salted water before they go into the oven. That’s the difference between a bright green snap and a grey, mushy mess that nobody wants to eat. I learned the hard way that raw beans won’t soften enough in the sauce alone, so don’t try to save time by skiping the pot of water.
The mushrooms are doing more work than you’d think here because they provide all the savory depth without the metallic taste of a tin can. Using a mix of fresh fungi and real cream makes the liquid thick enough to coat every vegetable perfectly. I’ve brought this to three different potlucks, and it’s always the first dish to be scraped clean.
Alton Brown Green Bean Casserole Recipe Ingredients
For the Topping:
- 2 medium onions, thinly sliced
- 1/4 cup (30g) all-purpose flour
- 2 tablespoons (15g) panko breadcrumbs
- 1 teaspoon fine salt
- Vegetable oil, for frying
For the Beans and Sauce:
- 1 pound (450g) fresh green beans, trimmed and halved
- 2 tablespoons (30g) butter
- 12 ounces (340g) mushrooms, sliced
- 2 cloves garlic, minced
- 1/4 teaspoon ground nutmeg
- 2 tablespoons (15g) all-purpose flour
- 1 cup (240ml) chicken broth
- 1 cup (240ml) half-and-half
- Salt and black pepper to taste
How To Make Alton Brown Green Bean Casserole Recipe
- 1. Fry the onions: Toss the sliced onions with the flour, panko, and salt in a bowl until they’re coated. Heat an inch of oil in a heavy pan and fry the onions in batches until they turn golden brown, then drain them on paper towels.
- 2. Blanch the beans: Bring a large pot of water to a boil with a heavy pinch of salt. Drop the green beans in for exactly 5 minutes, then immediately move them into a bowl of ice water to stop the cooking.
Make sure the beans are bone dry before you add them to the sauce later. If they’re dripping with water, the mushroom cream will turn thin and watery instead of staying thick and glossy.
- 3. Cook the mushrooms: Melt the butter in a large skillet over medium heat and add the sliced mushrooms. Cook them without moving them too much at first so they brown properly, then stir in the garlic and nutmeg once the moisture has evaporated.
- 4. Build the sauce: Sprinkle the flour over the mushrooms and stir for a minute to cook out the raw taste. Slowly pour in the chicken broth and half-and-half, whisking the whole time to keep the texture smooth.
- 5. Simmer and thicken: Let the sauce bubble gently for about 5 minutes until it’s thick enough to coat the back of a spoon. Taste it now and add as much salt and pepper as you think it needs before the beans go in.
- 6. Combine and bake: Stir the dry green beans into the mushroom sauce and pour the whole mixture into a baking dish. Top the beans with a handful of the fried onions and bake at 200°C (400°F) for about 15 minutes.
- 7. Add the final crunch: Take the dish out of the oven and pile the rest of the fried onions on top in an even layer. Put it back in for another 5 minutes so the topping gets extra crispy without burning the onions.
Recipe Tips
- Use a mandoline for the onions: Getting the slices exactly the same thickness means they’ll all brown at the same rate in the oil. If some are thick and others are paper-thin, you’ll end up with a mix of soggy and burnt pieces.
- Don’t crowd the frying pan: If you put too many onions in the oil at once, the temperature drops and they’ll soak up grease instead of getting crunchy. Fry them in small groups to keep the oil bubbling hot.
- Choose cremini mushrooms for flavor: While white button mushrooms work fine, the darker cremini or baby bella varieties have a much deeper taste. They hold their shape better in the sauce and don’t disappear into the cream.
- Salt the blanching water heavily: The beans only spend a few minutes in the pot, so the water needs to be as salty as the sea to actually flavor the vegetable. This is your only chance to season the beans from the inside out.
- Keep the half-and-half at room temperature: Pouring ice-cold dairy into a hot pan can sometimes cause the sauce to break or take much longer to thicken. Measuring it out 20 minutes before you start makes the mixing process much faster.
- Trim the beans uniformly: Cutting all the green beans to roughly the same length makes the casserole much easier to serve and eat. Long, trailing beans make a mess on the plate and don’t distribute evenly in the mushroom mixture.
What To Serve With Green Bean Casserole
Roasted turkey or a thick slice of honey-glazed ham is the obvious choice for this side. The creamy sauce and salty onions are designed to go with savory meats and gravy.
For other sides, mashed potatoes or a simple cranberry sauce provide a nice change in texture. A piece of crusty sourdough bread is also great for mopping up any leftover mushroom cream.
How To Store Green Bean Casserole
- Fridge: Put the leftovers in a container with a tight lid and keep them for up to 3 days. The onions will lose their crunch in the damp air, so try to store any extra topping separately if you can.
- Reheat: The oven is the only way to save this dish. Put it in at 175°C (350°F) for ten minutes to warm the center and help the fried onions crisp back up. The microwave will just make the topping soft and chewy.
- Freeze: I don’t recommend freezing this because the cream sauce often separates when it thaws. The green beans also lose their snap and become quite mushy once they’ve been frozen and thawed.
Alton Brown Green Bean Casserole Recipe Nutrition Facts
Per serving (1 of 6):
- Calories: 310 kcal
- Protein: 7g
- Fat: 22g
- Carbohydrates: 24g
- Sugar: 6g
- Sodium: 580mg
FAQs
Can I use frozen beans for this Alton Brown Green Bean Casserole Recipe?
Yes, but you should thaw them completely and pat them dry with a towel before adding them to the sauce. You can skip the boiling step since frozen beans are usually blanched before they’re packed.
Why is my mushroom sauce too thin?
You might not have let it simmer long enough or the beans were still wet when you mixed them in. Let the liquid bubble for an extra minute or two until it looks like heavy gravy before you put it in the oven.
Can I make the fried onions ahead of time?
Yes, you can fry the onions a day early and keep them in a sealed container at room temperature. Don’t put them in the fridge or they’ll get soft from the moisture.
What’s the best substitute for half-and-half?
You can use a mix of equal parts whole milk and heavy cream to get the same richness. Using just milk will make the sauce too runny, and using only cream might make the dish feel too heavy.
Can I bake this Alton Brown Green Bean Casserole Recipe at a lower temperature?
No, the high heat is necessary to bubble the sauce and crisp the topping quickly. If you cook it too slow, the beans will turn mushy before the onions get that deep golden color.
Try More Recipes:
Alton Brown Green Bean Casserole Recipe
Description
Alton Brown’s Green Bean Casserole completely reinvents the Thanksgiving staple by ditching the canned goods. It features crisp-tender, freshly blanched green beans smothered in a rich, homemade cremini mushroom and half-and-half cream sauce. The crown jewel is the topping: thinly sliced, freshly pan-fried onions that provide an irresistible, golden-brown crunch.
Ingredients
For the Topping:
For the Beans and Sauce:
Instructions
- Fry the onions: Toss the sliced onions with the flour, panko, and salt in a bowl until they’re coated. Heat an inch of oil in a heavy pan and fry the onions in batches until they turn golden brown, then drain them on paper towels.
- Blanch the beans: Bring a large pot of water to a boil with a heavy pinch of salt. Drop the green beans in for exactly five minutes, then immediately move them into a bowl of ice water to stop the cooking.
- Cook the mushrooms: Melt the butter in a large skillet over medium heat and add the sliced mushrooms. Cook them without moving them too much at first so they brown properly, then stir in the garlic and nutmeg once the moisture has evaporated.
- Build the sauce: Sprinkle the flour over the mushrooms and stir for a minute to cook out the raw taste. Slowly pour in the chicken broth and half-and-half, whisking the whole time to keep the texture smooth.
- Simmer and thicken: Let the sauce bubble gently for about five minutes until it’s thick enough to coat the back of a spoon. Taste it now and add as much salt and pepper as you think it needs before the beans go in.
- Combine and bake: Stir the dry green beans into the mushroom sauce and pour the whole mixture into a baking dish. Top the beans with a handful of the fried onions and bake at 200°C (400°F) for about 15 minutes.
- Add the final crunch: Take the dish out of the oven and pile the rest of the fried onions on top in an even layer. Put it back in for another five minutes so the topping gets extra crispy without burning the onions.
Make sure the beans are bone dry before you add them to the sauce later. If they’re dripping with water, the mushroom cream will turn thin and watery instead of staying thick and glossy.
Notes
-
Use a mandoline for the onions: Getting the slices exactly the same thickness means they’ll all brown at the same rate in the oil. If some are thick and others are paper-thin, you’ll end up with a mix of soggy and burnt pieces.
Don’t crowd the frying pan: If you put too many onions in the oil at once, the temperature drops and they’ll soak up grease instead of getting crunchy. Fry them in small groups to keep the oil bubbling hot.
Choose cremini mushrooms for flavor: While white button mushrooms work fine, the darker cremini or baby bella varieties have a much deeper taste. They hold their shape better in the sauce and don’t disappear into the cream.
Salt the blanching water heavily: The beans only spend a few minutes in the pot, so the water needs to be as salty as the sea to actually flavor the vegetable. This is your only chance to season the beans from the inside out.
Keep the half-and-half at room temperature: Pouring ice-cold dairy into a hot pan can sometimes cause the sauce to break or take much longer to thicken. Measuring it out 20 minutes before you start makes the mixing process much faster.
Trim the beans uniformly: Cutting all the green beans to roughly the same length makes the casserole much easier to serve and eat. Long, trailing beans make a mess on the plate and don’t distribute evenly in the mushroom mixture.
