Ultimate Green Bean Casserole
featured in Tasty Holiday Sides & Desserts
This casserole is a classic for a reason! With crispy fried onions, tender green beans, and a creamy mushroom sauce, it's a dish that's sure to please. It's the ultimate comfort food that will have everyone coming back for seconds.
Tasty Team
May 04, 2023
97% would make again

Inspired by buzzfeed.com
Ingredients
for 12 servings
- 2 lb green beans (910 g), trimmed
- 8 tablespoons unsalted butter, 1 stick, divided
- 2 medium white onions, thinly sliced
- 1 ½ lb cremini mushroom (680 g), sliced and stemmed
- 5 cloves garlic, sliced
- 3 tablespoons all purpose flour
- 1 cup milk (240 mL)
- ½ cup heavy cream (120 mL)
- 2 teaspoons kosher salt
- 1 teaspoon freshly ground black pepper
- 1 cup chicken broth (240 mL), or vegetable broth
- ½ cup grated parmesan cheese (55 g)
- 1 cup fried onion (250 g)
Nutrition Info
- Calories 291
- Fat 20g
- Carbs 22g
- Fiber 11g
- Sugar 7g
- Protein 9g
Estimated values based on one serving size.
Preparation
- Preheat the oven to 400˚F (200˚C).
- In a large pot of salted boiling water, blanch the green beans for 3 minutes, until tender and bright green. Drain and transfer to a 9x13-inch (23x33 cm) baking dish.
- Melt 4 tablespoons of butter in a large pan over high heat. Add the onions and cook for 8 minutes, until softened and translucent.
- Add the mushrooms and cook for 5 minutes, until browned. Add the garlic and cook just until fragrant, about 1 minute.
- Transfer the vegetable mixture to the casserole dish with the green beans. Wipe out the pan.
- Melt the remaining 4 tablespoons of butter in the same pan. Add the flour and stir to combine. Cook until a golden brown roux forms, for 5 minutes.
- Add the milk, heavy cream, salt, pepper, chicken broth, and Parmesan cheese, and stir to combine. Reduce the heat to medium-low and cook until the sauce is thickened, about 10 minutes.
- Pour the sauce evenly over the vegetables in the casserole dish and toss until everything is well coated. Cover with foil.
- Bake for 20 minutes, then remove the foil and bake for another 10 minutes.
- Top the casserole with the fried onions, then serve.
- Enjoy!
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Inspired by buzzfeed.com