Green Bean Casserole

Everybody knows this casserole, but not everybody knows it the way Grandma made it — from scratch, with no can of soup in sight. She said the canned version was fine for folks in a hurry, but for Thanksgiving, you take the extra twenty minutes and make the sauce yourself. Fresh green beans, a pan of mushrooms cooked down in butter, and a cream sauce you stir with her old wooden spoon until it coats the back just right.

The beans stay bright and tender, not tired and gray. The sauce tastes like real mushrooms and real cream, because it is. And on top goes a tumble of onions you fried yourself, golden and crisp and salty, the kind people pick off and eat straight from the dish while they’re supposed to be setting the table.

It still comes to the table bubbling in the same old baking dish, and it still disappears faster than almost anything else on it. Make it once from scratch and you’ll understand why Grandma never opened that can — and why nobody at your table will miss it.

Why This Recipe Works

• Fresh beans, blanched just right — a quick boil and an ice bath keep the beans tender-crisp and green, never mushy or dull.
• A real mushroom cream sauce — mushrooms browned in butter, a little flour, milk and cream make a sauce with deep, honest flavor no canned soup can match.
• Fried onions made at home — thin-sliced onions tossed in seasoned flour and fried crisp go on at the end, so the topping stays crunchy over the creamy beans.

Green Bean Casserole

Fresh green beans in a homemade mushroom cream sauce, baked under a blanket of crispy fried onions. The holiday classic, made completely from scratch — no canned soup.

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Prep Time 20 minutes mins

Cook Time 35 minutes mins

Total Time 55 minutes mins

Servings: 8

Course: Side Dish

Cuisine: American

Calories: 210

Ingredients Method Notes

Ingredients

  

For the crispy fried onions

• 2 large yellow onions halved and sliced very thin
• 1/2 cup all-purpose flour
• 1 tsp kosher salt
• 1/4 tsp black pepper
• 1 cup vegetable oil or other neutral oil, for frying

For the green beans

• 2 lbs fresh green beans trimmed and cut in half
• 1 tbsp kosher salt for the blanching water

For the mushroom cream sauce

• 2 tbsp unsalted butter
• 12 oz cremini or white mushrooms sliced
• 2 garlic cloves minced
• 1/2 tsp dried thyme or 1 tsp fresh thyme leaves
• 2 tbsp all-purpose flour
• 1 cup chicken broth or vegetable broth
• 1 cup whole milk
• 1/2 cup heavy cream
• 1 tsp Worcestershire sauce
• 1/4 tsp ground nutmeg
• 3/4 tsp kosher salt plus more to taste
• 1/2 tsp black pepper

Method

 

1. Make the crispy onions first: toss the thin-sliced onions with the flour, salt and pepper until every strand is coated, shaking off the excess. Heat the oil in a large skillet over medium-high heat until it shimmers. Fry the onions in two batches, stirring now and then, 5–7 minutes per batch, until deep golden and crisp. Lift them out with a slotted spoon onto a paper towel-lined plate and sprinkle lightly with salt. Set aside.
2. Heat the oven to 375°F (190°C). Grease a 9×13-inch baking dish (or a 2 1/2-quart casserole) with butter.
3. Blanch the beans: bring a large pot of water to a rolling boil, add the 1 tablespoon salt, then the green beans. Cook 4–5 minutes, until bright green and just tender-crisp. Drain and plunge straight into a big bowl of ice water to stop the cooking. Drain again and pat dry.
4. Make the sauce: melt the butter in a large skillet over medium-high heat. Add the mushrooms and cook, without stirring too much, 6–8 minutes, until they give up their liquid and turn golden brown. Stir in the garlic and thyme and cook 30 seconds, until fragrant.
5. Sprinkle the flour over the mushrooms and stir for 1 minute. Slowly pour in the broth, stirring as you go, then stir in the milk and cream. Simmer gently 4–5 minutes, stirring often, until the sauce thickens enough to coat the back of a spoon. Stir in the Worcestershire sauce, nutmeg, salt and pepper. Taste and adjust the salt.
6. Fold the drained green beans into the sauce until every bean is coated, then scrape it all into the prepared dish and smooth the top.
7. Bake uncovered 20–25 minutes, until bubbling hot all the way through and at the edges.
8. Scatter the crispy fried onions thickly over the top and return to the oven 3–5 minutes, just until the onions are warmed and extra crisp. Rest 5 minutes before serving. Serve warm, straight from the dish.

Notes

Make ahead: blanch the beans and make the mushroom sauce up to 1 day ahead; refrigerate them separately (or combined in the baking dish, covered). Fry the onions up to 1 day ahead and keep them in an airtight container at room temperature. Bake the casserole, adding 5–10 minutes if it goes in cold, and add the onions for the last 3–5 minutes.

Leftovers keep 3 days in the fridge, covered. Reheat at 325°F until hot — the topping will soften a little, but a few minutes uncovered at the end helps crisp it back up. Not ideal for freezing, as the cream sauce can separate and the onions go soggy.

Nutrition is an estimate per serving.

Grandma’s Tips

1. Dry beans make a thick casserole. After the ice bath, drain the beans well and pat them dry. Water clinging to the beans will thin that beautiful sauce in the oven.
2. Let the mushrooms brown. Don’t crowd them and don’t keep stirring. Color on the mushrooms is flavor in the sauce — pale mushrooms make a pale-tasting casserole.
3. Slice the onions thin as you can. Thin onions fry up lacy and crisp; thick slices stay chewy in the middle. Shake off the extra flour so they don’t taste pasty.
4. Keep the topping off until the end. The onions only need 3–5 minutes in the oven. Put them on at the start and they’ll go from golden to burnt while the casserole is still heating through.
5. Season the sauce, then taste a bean. The beans themselves carry no salt inside, so the sauce should taste a touch generously seasoned before the two meet.

Frequently Asked Questions

Can I make green bean casserole ahead of time?

Yes. Blanch the beans and make the sauce a day ahead and refrigerate them combined in the baking dish, covered. Fry the onions ahead too and store them at room temperature in an airtight container. Bake as directed, adding 5–10 minutes from cold, and top with the onions for the last few minutes.

Can I use frozen green beans instead of fresh?

You can. Use 2 lbs of frozen cut green beans, thawed and patted very dry — skip the blanching, since they’re already blanched before freezing. Fresh beans give the best color and bite, but frozen are a fine weeknight stand-in.

Why is my casserole watery?

Usually the beans went in wet, or the sauce didn’t simmer long enough to thicken. Pat the blanched beans dry, and let the sauce cook until it clearly coats the back of a spoon before folding everything together.

Can I use canned fried onions in a pinch?

Grandma would sigh, but yes — life happens. Use about 2 1/2 cups of store-bought crispy fried onions and add them in the last 5 minutes as directed. The homemade ones are worth it when you have the time, though.

What mushrooms work best?

Cremini (baby bella) mushrooms give the deepest flavor for the money, but plain white mushrooms work just fine. Avoid pre-sliced mushrooms if you can — they tend to be thick and dry, and fresh-sliced cook up more tender.