Ultimate Green Bean Casserole · i am a food blog

Ultimate Green Bean Casserole · i am a food blog

Green bean casserole is an umami bomb of a dish that was invented long before the word umami came to the English language and stood the test of time and food trends.

This is a modernized, updated, scratch version with nary a canned or processed ingredient in sight, except for the fried onions.

This version is more mushroom-y, more flavorful, and only about 10 minutes of extra work. It’s enhanced with the combined umami powers of caramelized onions, double the mushrooms, soy sauce, fish sauce, and parmigiano-reggiano cheese. I think you’ll love it so much more than the classic canned soup version.

green bean casserole | www.iamafoodblog.com

Who invented green bean casserole?

Dorcas Reilly–a recipe developer for Campbell’s–invented green bean casserole back in 1955. She wanted it to be a few simple and affordable ingredients and as little prep as possible while still tasting great – and using at least one Campbell’s product. She did an iconic job that’s even more amazing when you realize it’s basically vegetarian.

How to make green bean casserole

Green bean casserole is super easy to make. No matter what version or recipe, the process is the same:

  1. Prepare your mushroom soup, add fried onions and soy sauce.
  2. Blanch your fresh green beans (or open your can of green beans, you monster).
  3. Assemble and bake until bubbling and toasty.
  4. Top with fried onions and bake a little longer until onions are warmed and extra crispy.
  5. Eat!

classic green bean casserole | www.iamafoodblog.com

The classic campbells green bean casserole

I made a tiny tiny example of the original recipe (pictured above) to refresh my memory and it was really good. If you are feeling lazy, there is absolutely nothing wrong with the original recipe as written.

If you want to make the classic version: it’s 1 can condensed cream of mushroom soup, 1 can of milk, 1 tsp soy sauce, 1lb green beans, and a 6oz package of french fried onions. Combine the soup, milk, soy sauce, green beans, salt and pepper, and half the onions. Bake for 25-30 minutes, then top with the remaining onions, and bake another 5 minutes.

Why make green bean casserole from scratch then?

Our grocery stores have better than canned green beans now. And we can do better than processed cream of mushroom soup too. You don’t have to invest a lot of extra time (just an extra 5-10 minutes of work and another 10 minutes of simmering) and you can have yourself some beautiful cream of mushroom soup to use as a base for the best green bean casserole – or pasta!

mushroom soup for green bean casserole | www.iamafoodblog.com

This green bean casserole recipe

Every component of the classic dish has been upgraded:

  • Mushroom soup + milk: make our own, even more mushroom-y. Mushroom++
  • Soy sauce: I recommend a 1-2 punch of dark mushroom soy sauce + fish sauce.
  • Canned green beans: switch out for very briefly blanched farm fresh green beans.
  • French’s fried onions: Actually you can’t improve this, more on this later down.

Fresh vs canned vs frozen green beans

But what if you somehow can’t get fresh green beans, like if there was a pandemic and supply lines collapsed? Hopefully that never happens, but if it does, you’re better off with frozen than canned. Frozen vegetables are flash frozen and retain all their nutrients, taste, and most of their texture when cooked properly.

blanched green beans | www.iamafoodblog.com

sliced mushrooms | www.iamafoodblog.com

Pictured: hand chosen, hand sliced. Not pictured: 20 minutes of life, lost.

Soy sauce vs fish sauce

Believe it or not, soy sauce was integral to this recipe right when it was invented in the 50s. I’m personally shocked that it was a popular enough ingredient back then that they included it, but it definitely adds a deep layer of flavor you can’t get otherwise.

If you are really well stocked (or just shopping for a fresh bottle), mushroom dark soy sauce is a great choice for extra mushroom flavor. It goes great with anything you’d ever want to use soy sauce for.

The onions

Although everything else in this recipe is scratch made, you shouldn’t go homemade just for homemade’s sake. Unless you own tens of thousands of dollars of commercial dehydration and deep fry equipment, you likely can’t match the quality of commercially fried onions.

If you don’t live in a place where they sell fried onions, almost all asian supermarkets sell fried onions or shallots. So does IKEA, although both of these are unseasoned fried onions compared to classic supermarket fried onions. And of course, Amazon.

french fried onions on green bean casserole | www.iamafoodblog.com

How long to bake green bean casserole

Green bean casserole is completely cooked before it ever goes into the oven, so how long it stays in there is up to you too. The reason we bake it is to meld all the flavors together and caramelize the mushrooms and onions in the soup. Although it says 30 minutes here, you can easily go as little as 15 minutes.

Make ahead green bean casserole

Can you make this ahead? Yes! If you want zero stress and you’re making it within 24 hours, you can put the entire thing together, cover it, and store it in the fridge. Just add 10-20 minutes cooking time. The best way is to trim the green beans and make the mushroom stock, but don’t blanch the beans until you are ready to assemble.

green bean casserole | www.iamafoodblog.com

Green Bean Casserole Recipe | www.iamafoodblog.com

Green Bean Casserole Recipe

A super mushroom-y, freshly made update on classic green bean casserole

Serves 4

Prep Time 25 mins

Cook Time 35 mins

Total Time 1 hr

  • 4 tbsp butter or olive oil, or mix of the two
  • 4 cloves garlic crushed
  • 1/2 medium onion sliced
  • 1 lb mushrooms pre-sliced cremini preferred
  • 4-8 sprigs thyme or other herbs
  • 2 tbsp all purpose flour
  • 3/4 cup white wine or beef/chicken/vegetable stock
  • 1 cup heavy cream
  • 0.5-1 cup milk optional, see notes
  • 1 tbsp dark mushroom soy sauce or regular soy sauce
  • 1 tsp fish sauce optional
  • 1/2 cup french fried onions


  • 1.5 lb green beans ends trimmed
  • 1/2 cup Parmigiano Reggiano cheese or Cheddar
  • 1 cup french fried onions or more, to finish
  • Melt the butter over medium heat, being careful not to burn it. Sauté onions for 2-3 minutes, then add garlic and cook for about 1 minute. Add mushrooms and thyme. Cook, stirring occasionally, until mushrooms are toasty brown, about 7 minutes. Add flour, salt, and pepper, and stir for another 2 minutes until the flour is thoroughly incorporated.

  • Add wine and reduce by half, about 3 minutes. Reduce heat to low, then add cream, soy sauce, fish sauce, milk (If using) and fried onions. Stir, season, and simmer for 10-15 minutes.

  • While you are waiting for your sauce to thicken, blanch your green beans in boiling salted water for 3 minutes, then drain and cool. If you like your green beans on the squeaky crunchy side, use an ice bath. Preheat your oven to 375ºF too.

  • To assemble: make a bed of green beans in a large oven proof dish. Ladle the mushroom sauce over top of that, and top with parmesan. Bake for 30 minutes at 375ºF.

  • Remove from oven, carefully toss the green beans a little, then top with more onions. Return to the oven for another 5 minutes or until onions are crispy.

Add milk if you prefer your casserole on the saucier side, leave out if you prefer your casserole thicker. Pictured with no milk added.

Nutrition Facts

Green Bean Casserole Recipe

Amount Per Serving

Calories 513
Calories from Fat 306

% Daily Value*

Fat 34g52%

Saturated Fat 15.8g99%

Cholesterol 79mg26%

Sodium 574mg25%

Potassium 880mg25%

Carbohydrates 36g12%

Fiber 5.3g22%

Sugar 5.2g6%

Protein 10.2g20%

* Percent Daily Values are based on a 2000 calorie diet.

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