Breakfast • Christmas

Green Bean Casserole

Name: Green Bean Casserole
Prep time: 15 min
Cook time: 35 min
Total time: 50 min
Yield: 8 servings
Ingredients: 2 lb fresh green beans, trimmed; 3 Tbsp unsalted butter; 8 oz mushrooms, sliced; 3 Tbsp all-purpose flour; 1 1/2 cups whole milk; 1/2 cup chicken or vegetable broth; 1 Tbsp soy sauce; 1 tsp salt plus 1/2 tsp black pepper; 6 oz crispy fried onions, divided

Crisp green beans in creamy mushroom sauce with a crunchy fried-onion top for the Christmas table.

Updated: Oct 7, 2026

⏱ 50 mintotal

8servings

190 kcalper serving

Easylevel

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Why you'll like it

Ready in about 50 min.
Serves 8 — easy to halve or double.
Easy level — everyday equipment only.
Stays juicy when cooked to 165°F (74°C).
Storage, freezing and reheating covered below.

Green Bean Casserole pairs snappy beans with a quick mushroom cream sauce and a crisp fried-onion crust. Blanching fresh beans for 4 minutes sets bright color and a tender-crisp bite that survives baking.

Food safety: do not wash raw chicken — it spreads bacteria around the sink. Pat dry, avoid cross-contact with ready-to-eat food, and cook to 165°F (74°C) internal temperature.

Helpful guides

Instructions

Step 1

Heat the oven to 350 degrees F and butter a 9 by 13 inch baking dish. Blanch the beans in heavily salted boiling water for 4 minutes until bright green and just bendable. Shock in ice water, then drain well so extra water does not thin the sauce.

Step 2

Melt the butter in a large skillet over medium-high heat and brown the mushrooms for 6 to 8 minutes until golden and their liquid evaporates. Browning builds the savory flavor that replaces canned soup. Sprinkle flour over the mushrooms and stir 1 minute to cook out the raw taste.

Step 3

Pour in the milk and broth gradually while whisking to keep the sauce smooth. Simmer 3 to 4 minutes until thick enough to coat a spoon. Stir in the soy sauce, salt, and pepper, then taste; the sauce should be well seasoned since plain beans dilute flavor.

Step 4

Fold the drained beans with half the fried onions into the sauce and spread into the dish. Mixing some onions inside adds crunch through the middle, not just on top. Smooth the surface so the topping layer sits evenly.

Step 5

Bake uncovered for 25 minutes until hot and bubbling at the edges. Bubbling shows the sauce has melded with the beans. Scatter the remaining fried onions over the top and bake 10 minutes more until deep golden and crisp.

Step 6

Rest 10 minutes so the sauce sets for cleaner scoops. Serve hot, since the onion crust softens as it sits. Cool leftovers within 2 hours and refrigerate promptly for later meals.

Troubleshooting — fixes, not repeats

If the onion top turns soggy, it went on too early or the dish sat covered. Add topping only for the last 10 minutes and serve promptly without a lid.
If the sauce tastes thin, beans carried in water or the roux undercooked. Drain beans fully, simmer sauce until it coats a spoon, and rest before serving.
If lumps form, milk was added too fast. Pour gradually while whisking and keep a steady simmer; strain the sauce if a few lumps persist.
If beans turn gray-green, they overcooked before baking. Blanch exactly 4 minutes, shock in ice water, and avoid frozen beans thawed to mush.

Make it your way

Spicier version: A cheddar version stirs 1 cup shredded cheese into the hot sauce off the heat.
For variation, use frozen cut beans thawed and patted dry, adding 5 minutes to the bake.
Swap mushrooms for diced water chestnuts and celery for extra crunch.
For a lighter dish, use 2 percent milk and bake in a shallow dish for more crust.

Storage & reheating

Cool leftovers within 2 hours, then refrigerate in a covered container and use within 3 to 4 days. Reheat only the portion you will eat until steaming hot throughout — poultry and reheated rice should reach 165°F (74°C).

Reheat covered at 350 degrees F for 15 to 20 minutes until steaming, then uncover 5 minutes to re-crisp the top.

Freeze the bean-sauce base without onions up to 2 months; thaw overnight in the refrigerator and add fresh fried onions for baking.

FAQ

Can I assemble it ahead?
Yes, up to 1 day ahead. Prepare beans and sauce, combine in the dish, cover, and refrigerate without the onion topping. Bake 5 to 10 minutes longer from cold, then add onions for the final 10 minutes until crisp.

Fresh, frozen, or canned beans?
Fresh blanched beans give the best color and bite. Thawed frozen beans work when patted very dry. Canned beans turn soft and gray, so use them only in a pinch and shorten the first bake by 5 minutes.

How do I keep the topping crunchy?
Top only for the last 10 minutes of baking, serve hot, and never cover the hot dish. For leftovers, re-crisp uncovered in the oven rather than the microwave, which steams the onions soft.