Lactose Free Classic Mushroom Green Bean Casserole

Total time1 hr 5 min

Prep time20 min

Cook time45 min

Lactose Free Classic Mushroom Green Bean Casserole

Tender green beans get folded into a deeply savory mushroom sauce built from sautéed onion, garlic, and cremini mushrooms cooked down until golden and fragrant. A touch of flour brings body to the sauce, while a splash of soy sauce and a grate of fresh nutmeg add warmth and depth beneath all that earthy mushroom flavor. Everything gets tossed with crispy fried onions, then baked until the top turns deep golden brown and the edges bubble at the sides of the dish. It's the same cozy, spoonable casserole you remember from holiday tables, with a rich, velvety sauce clinging to every green bean. This version is an easy one to bring to a lactose free spread without anyone noticing what's missing. Let it rest a few minutes out of the oven so the sauce sets up perfectly before you dig in.

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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
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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