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Creamy Green Bean Casserole Recipe: Easy Homemade with Crispy Onions & Parmesan

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This creamy green bean casserole features a homemade cream sauce, fresh green beans, crispy onions, and Parmesan cheese for a nostalgic, crowd-pleasing side dish perfect for holidays or weeknight dinners.

Ingredients

Scale
  • 2 tablespoons unsalted butter
  • 1 small yellow onion, finely diced
  • 2 cloves garlic, minced
  • 2 tablespoons all-purpose flour
  • 1 cup whole milk
  • 1 cup low-sodium chicken or vegetable broth
  • 1/2 cup sour cream
  • 1/2 cup grated Parmesan cheese
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1/8 teaspoon ground nutmeg
  • 1 1/2 pounds fresh green beans, trimmed and cut in half
  • 1 1/4 cups crispy fried onions
  • 1/4 cup grated Parmesan cheese
  • Optional: 1/2 cup sliced mushrooms, sautéed
  • Optional: 1/4 cup chopped cooked bacon

Instructions

  1. Bring a large pot of salted water to a boil. Add green beans and blanch for 4-5 minutes until bright green and just tender. Drain and rinse under cold water.
  2. In the same pot, melt butter over medium heat. Add diced onion and sauté for 3-4 minutes until soft. Stir in garlic and cook for 30 seconds.
  3. Sprinkle flour over onions, stirring constantly for 1 minute until lightly golden. Slowly whisk in milk and broth. Simmer for 3-5 minutes until thickened.
  4. Remove from heat. Stir in sour cream, Parmesan, salt, pepper, and nutmeg. Taste and adjust seasoning.
  5. In a large mixing bowl, toss blanched green beans with the creamy sauce until evenly coated. Fold in mushrooms or bacon if using.
  6. Pour mixture into a 9×13-inch oven-safe baking dish. Smooth top. Sprinkle with crispy onions and Parmesan.
  7. Preheat oven to 375°F. Cover dish loosely with foil and bake for 20 minutes. Remove foil and bake another 10-15 minutes until golden brown and bubbling.
  8. Let casserole sit for 5-10 minutes before serving.

Notes

For gluten-free, use a gluten-free flour blend and crispy onions. For dairy-free, substitute milk and sour cream with non-dairy alternatives and use nutritional yeast for Parmesan. Blanch beans just until crisp-tender for best texture. Add crispy onions in the last 15 minutes of baking for maximum crunch. Let casserole rest before serving to thicken sauce.

Nutrition

Keywords: green bean casserole, creamy casserole, holiday side dish, Thanksgiving, crispy onions, Parmesan, comfort food, easy casserole, vegetarian, homemade

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