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Irresistible Green Bean Casserole Recipe with Crispy Onions Easy and Perfect

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A creamy, savory green bean casserole topped with golden, crunchy fried onions, perfect for holidays or any occasion. This recipe uses a homemade mushroom sauce for fresh, comforting flavor.

Ingredients

Scale
  • 1 ½ pounds fresh green beans, trimmed and blanched
  • 3 tablespoons unsalted butter
  • 8 ounces cremini mushrooms, sliced thinly
  • 1 medium yellow onion, finely chopped
  • 2 cloves garlic, minced
  • 3 tablespoons all-purpose flour
  • 1 ½ cups milk (whole or 2%)
  • ½ cup vegetable or chicken broth
  • 1 teaspoon Worcestershire sauce
  • Salt and black pepper to taste
  • 1 ½ cups French fried onions
  • ¼ cup grated Parmesan cheese (optional)

Instructions

  1. Bring a large pot of salted water to a boil. Add the fresh green beans and blanch for 3 minutes until bright green and just tender. Immediately drain and transfer them to a bowl of ice water to stop cooking. Drain again and set aside.
  2. In a large skillet, melt 3 tablespoons of unsalted butter over medium heat. Add the chopped onion and sauté until translucent, about 4 minutes. Add the sliced mushrooms and cook until they release moisture and start browning, about 6-7 minutes.
  3. Stir in the minced garlic and cook for 30 seconds until fragrant. Sprinkle the flour evenly over the veggies and stir constantly for 2 minutes to form a roux.
  4. Gradually whisk in 1 ½ cups milk and ½ cup broth, making sure there are no lumps. Add Worcestershire sauce, salt, and freshly ground black pepper to taste. Bring to a gentle simmer and cook, stirring often, until thickened, about 5-7 minutes.
  5. If using, stir in ¼ cup grated Parmesan cheese.
  6. Remove the sauce from heat and gently fold in the blanched green beans until well coated.
  7. Spread the green bean mixture evenly in an 8×8-inch baking dish. Sprinkle 1 ½ cups French fried onions evenly over the top.
  8. Preheat oven to 350°F (175°C). Bake uncovered for 20-25 minutes, or until bubbly and onions are golden brown. Cover loosely with foil if onions brown too quickly.
  9. Let the casserole rest for 5 minutes before serving.

Notes

Blanch green beans to keep them crisp and vibrant. Cook mushrooms low and slow for best flavor. Add fried onions late in baking and watch closely to prevent burning. If sauce is too thick before baking, stir in a little extra milk to loosen.

Nutrition

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

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