Green Bean Casserole from Scratch Recipe

Name: Green Bean Casserole from Scratch
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Yield: 8 servings
Cuisine: American
Ingredients: 1 1/2 lbs fresh green beans, trimmed and halved; 3 tbsp butter; 12 oz cremini mushrooms, sliced; 3 cloves garlic, minced; 3 tbsp flour; 1 cup chicken broth; 1 cup half-and-half; 1 tsp soy sauce; 3/4 tsp salt, 1/2 tsp pepper; 1 1/2 cups crispy fried onions, plus 1 cup for topping

Prep Time: 30 min Cook Time: 30 min Total: 1 hr Servings: 8

From-scratch green bean casserole with crispy fried onion topping

Green bean casserole from scratch is the Thanksgiving upgrade people don't believe until they taste it: blanched fresh green beans in a real mushroom cream sauce, still crowned with the fried onions everyone would riot without. The canned version was invented in 1955 to sell soup, and it's fine — but thirty extra minutes buys you snappy beans and a sauce with actual mushrooms in it. Make it once for the holiday table and the from-scratch version becomes your assignment for life. Consider yourself warned.

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Ingredients

1 1/2 lbs fresh green beans, trimmed and halved
3 tbsp butter
12 oz cremini mushrooms, sliced
3 cloves garlic, minced
3 tbsp flour
1 cup chicken broth
1 cup half-and-half
1 tsp soy sauce
3/4 tsp salt, 1/2 tsp pepper
1 1/2 cups crispy fried onions, plus 1 cup for topping

Instructions

Blanch the green beans in salted boiling water 4 minutes, then shock in ice water and drain. They should be bright and snappy.
Heat the oven to 375°F. Sauté the mushrooms in butter until browned, about 8 minutes; add garlic for the last minute.
Sprinkle in the flour and stir 1 minute. Whisk in the broth, then the half-and-half, soy sauce, salt, and pepper; simmer until it coats a spoon, 3–4 minutes.
Fold the beans and 1 1/2 cups of fried onions into the sauce; spread in a greased 9x13.
Bake 20 minutes, top with the remaining onions, and bake 8–10 more until bubbling and golden.

Ingredient Substitutions

Ingredient	Substitute	Notes
Fresh green beans	Frozen whole green beans	Skip blanching; thaw and pat dry
Half-and-half	Whole milk	A little lighter; simmer a minute longer
Soy sauce	Worcestershire	Both are the umami backbone — don't skip both
Fried onions	Homemade: thin-sliced onion, buttermilk dip, flour, shallow fry	For the full flex

Storage & Reheating

Refrigerate up to 3 days. Reheat at 350°F with a fresh scatter of onions — microwaving costs you the crunch.

Make ahead: assemble everything except the top onions a day early, refrigerate, and bake plus 10 minutes. Skip freezing — the sauce and beans both suffer.

Frequently Asked Questions

Can I still use canned green beans?

You can (drain two 14.5-oz cans well and skip blanching), but texture is the whole argument for from-scratch — frozen beats canned if fresh isn't happening.

Why is my sauce thin?

The flour needs its full minute of cooking and the sauce its simmer. It should coat a spoon before the beans go in — it loosens slightly in the oven.

What does the soy sauce do?

It's invisible umami — the same trick the original Campbell's recipe leaned on soup for. Nobody tastes soy; everyone tastes “more mushroom.”

How do I scale it for a big Thanksgiving?

It doubles cleanly into two 9x13s. Blanch the beans in batches so the water stays at a boil.