Thanksgiving Green Bean Casserole

A classic green bean casserole recipe with homemade cream sauce and fresh sautéed mushrooms.

By Delish

Original recipe source

Cook time: 85 minutes

Servings: 8

Ingredients

• 1 to taste Kosher salt
• 3 lb green beans, trimmed
• 4 Tbsp unsalted butter
• 2 whole yellow onions, thinly sliced
• 1 lb cremini mushrooms, sliced
• 4 cloves garlic, finely chopped
• 1 to taste Freshly ground black pepper
• 8 Tbsp unsalted butter
• 0.5 cup all-purpose flour
• 6 cups whole milk
• 1.5 cups French's fried onions

Instructions

1. Preheat oven to 350°. Prepare an ice bath in a large bowl.
2. In a large pot of generously salted boiling water, cook green beans, stirring occasionally, until bright green, 2 to 3 minutes.
3. Using a slotted spoon or tongs, transfer beans to ice bath to cool. Drain and transfer to another large bowl.
4. In another large pot or saucepan over medium heat, melt 4 Tbsp. butter. Add onion and a large pinch of salt and cook, stirring occasionally, until starting to soften, about 7 minutes.
5. Add mushrooms and cook, stirring often, until mushrooms are browned, about 7 minutes more. Add garlic and cook, stirring, until fragrant, about 1 minute; season with salt and pepper. Transfer onion mixture to bowl with green beans.
6. In same pot over medium heat, melt remaining 8 Tbsp. butter. Add flour and cook, whisking frequently, until golden and smells toasty, about 3 minutes.
7. Gradually whisk in milk; season with salt and pepper. Bring to a simmer and cook, stirring occasionally, until thickened, about 4 minutes. Add to bowl with green beans and stir to combine. Transfer to a 13" x 9" baking dish.
8. Bake green bean casserole until warmed through and bubbling, about 30 minutes.
9. Top with fried onions and continue to bake until warmed through, about 5 minutes more.