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Creamy Green Bean Casserole Recipe with Crispy Onions

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A comforting and easy-to-make green bean casserole featuring fresh green beans, a homemade creamy mushroom sauce, and topped with crispy fried onions for the perfect texture contrast.

Ingredients

Scale
  • 1½ pounds (680 grams) fresh green beans, trimmed and blanched
  • 4 tablespoons (56 grams) unsalted butter
  • 1 medium white or yellow onion, finely chopped
  • 2 garlic cloves, minced
  • 8 ounces (225 grams) cremini mushrooms, sliced
  • 3 tablespoons (24 grams) all-purpose flour
  • 2 cups (480 ml) whole milk or 2% milk
  • 1 cup (240 ml) chicken or vegetable broth
  • 1 teaspoon soy sauce or tamari
  • Salt and freshly ground black pepper, to taste
  • 1½ cups (about 45 grams) French fried onions
  • 1 tablespoon fresh thyme or parsley, finely chopped (optional)

Instructions

  1. Bring a large pot of salted water to a boil. Add the trimmed green beans and cook for 3-4 minutes until crisp-tender. Drain and transfer immediately to a bowl of ice water to stop cooking. Drain again and set aside.
  2. In a large skillet, melt the unsalted butter over medium heat. Add the finely chopped onion and sauté for about 5 minutes until translucent and sweet.
  3. Stir in the minced garlic and cook for 30 seconds until fragrant.
  4. Add the sliced cremini mushrooms and cook, stirring occasionally, for 7-8 minutes until soft and browned.
  5. Sprinkle the all-purpose flour over the mushrooms and stir well to coat. Cook for 1-2 minutes, stirring constantly to avoid lumps.
  6. Slowly whisk in the milk and broth, stirring constantly as the mixture thickens, about 4-5 minutes, until smooth and creamy.
  7. Stir in the soy sauce or tamari, and season with salt and freshly ground black pepper to taste. Remove from heat.
  8. Preheat the oven to 350°F (175°C). In a 9×13 inch (23×33 cm) baking dish, combine the blanched green beans with the mushroom sauce and mix gently but thoroughly.
  9. Sprinkle the French fried onions evenly over the top. For extra crunch, fold some onions into the casserole before topping.
  10. Bake uncovered for 25-30 minutes until bubbly and golden on top.
  11. Remove from oven and let rest for 5 minutes. Sprinkle with fresh thyme or parsley if desired before serving.

Notes

Layer some fried onions inside the casserole before topping to keep them crispy longer. If onions brown too fast, loosely cover casserole with foil halfway through baking. Let casserole rest 5 minutes before serving. For dairy-free, use plant-based milk and vegan butter. For gluten-free, use gluten-free flour and fried onions.

Nutrition

Keywords: green bean casserole, creamy green bean casserole, crispy onions, comfort food, mushroom sauce, holiday side dish, easy casserole

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