Name: Classic Green Bean Casserole
Prep time: 10 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Cuisine: American
Ingredients: 400 g Green Beans, trimmed and blanched; 1¼ cup Cream of Mushroom Soup, prepared or condensed-style; ⅓ cup Milk, to loosen the sauce; ¾ cup Button Mushrooms, sliced; 1 cup Crispy Fried Onions, divided; 1 tbsp Unsalted Butter, for mushrooms; ½ tsp Ground Black Pepper, freshly ground if possible; ¼ tsp Salt, adjust carefully because soup and onions may be salty

45 mintotal

40 min hands-on5 min hands-off

Prep 10 min · Cook 30 min

Serves: 4
Difficulty: Easy
Spice: Mild

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Ingredients

400 gGreen Beanstrimmed and blanched
1¼ cupCream of Mushroom Soupprepared or condensed-style
⅓ cupMilkto loosen the sauce
¾ cupButton Mushroomssliced
1 cupCrispy Fried Onionsdivided
1 tbspUnsalted Butterfor mushrooms
½ tspGround Black Pepperfreshly ground if possible
¼ tspSaltadjust carefully because soup and onions may be salty

Quantities are for 4 servings.

You'll need: Oven.

Includes 5 minutes of resting time after baking so the sauce thickens before serving.

Method

Heat the oven to 190°C and butter a small baking dish.
Cook the mushrooms in butter until they soften and release moisture.
Mix cream of mushroom soup, milk, black pepper, salt, mushrooms, and part of the fried onions.
Fold in the green beans and transfer the mixture to the baking dish.
Bake until hot and bubbling, then top with remaining crispy fried onions.
Bake a few more minutes until the topping is crisp and golden, then rest briefly before serving.

How to tell it's done

The green beans should be tender but not mushy, with creamy sauce and a crisp onion topping.

Getting it right

Tip

Add the final layer of fried onions near the end so they stay crisp instead of absorbing too much sauce.

What to serve it with

Serve as a holiday side with roast turkey, mashed potatoes, stuffing, or cranberry sauce.

Common mistakes

The topping is soft and pale.: The fried onions go on for the last few minutes only. Added at the start, they sit in steam for the whole bake and turn to paste — which is why the recipe holds most of them back.
The casserole is watery.: Cook the mushrooms until their liquid has gone, and drain the beans well. Both hold a surprising amount of water, and it all ends up under the topping.

Substitutions

Cream of Mushroom Soup — Use a homemade mushroom white sauce if you want to avoid prepared soup, but keep the sauce thick.
Crispy Fried Onions — Breadcrumbs can be used in a pinch, but fried onions give the classic casserole flavor.

Storing and reheating

Keeps three days in the fridge. Assemble it a day ahead without the onion topping and bake fresh — that is the standard way to get a holiday table out on time. Reheat uncovered so the topping crisps again.

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