Alpha Gal Friendly Classic Mushroom Green Bean Casserole

Total time1 hr 5 min

Prep time20 min

Cook time45 min

Alpha Gal Friendly Classic Mushroom Green Bean Casserole

This cozy, spoon-tender bake starts with green beans blanched just until bright and crisp, then folded into a deeply savory mushroom sauce built on sautéed onion, garlic, and thinly sliced cremini mushrooms. A touch of flour and chicken broth bring the sauce together into something rich and velvety, while nutmeg and black pepper round out the flavor with warmth. Everything gets tucked into a baking dish, layered with crispy fried onions, and baked until the top turns deep golden brown and the sauce bubbles at the edges. It's the kind of make-ahead comfort food that feels like a holiday table staple, and it holds up beautifully as a side or a main. This version is a great fit for an alpha-gal friendly kitchen, letting you enjoy the classic casserole experience without worry.

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Ingredients

8 servings

1 ½ lb fresh green beans, trimmed and cut into 1-inch pieces
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1 tsp salt, plus more for the blanching water

For the mushroom sauce

3 tbsp unsalted butter
Chef's tip
Use a stick or block-style dairy-free butter - not a soft tub spread - and swap one-for-one.
1 medium yellow onion, finely diced
3 cloves garlic, minced
10 oz cremini mushrooms, thinly sliced
3 tbsp all-purpose flour
1 ½ cups low-sodium chicken broth
¾ cup heavy cream
Chef's tip
Use unsweetened dairy-free heavy cream in cooked sauces, soups, and ganache. For whipped uses, choose a product labeled whippable.
1 tsp soy sauce
½ tsp black pepper
¼ tsp freshly grated nutmeg

For the topping

2 ½ cups crispy fried onions (one 6 oz can), divided

Instructions

1
Preheat the oven to 375°F (190°C). Bring a large pot of generously salted water to a boil. Add the green beans and cook for 5 minutes, until bright green and just barely tender but still with a firm bite. Drain in a colander and set aside.
2
Melt the butter in a large skillet over medium heat. Add the onion and cook, stirring occasionally, until softened and translucent, about 5 minutes. Add the garlic and cook, stirring, until fragrant, about 1 minute.

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