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5.0 from 438 votes

Homemade Green Bean Casserole

A homemade green bean casserole made from scratch with a creamy sauce and crispy fried onions. A classic old-fashioned Thanksgiving side dish recipe. 

Cook Time
mins
Servings: 6
Course: Side Dish
Cuisine: American

Ingredients

  • 1 lb. fresh green beans (ends snapped off)
  • 8 Tablespoons salted butter (divided)
  • 1 Large onion (chopped)
  • 8 ounces sliced mushrooms
  • 3 cloves garlic (minced)
  • 2 1/2 cups half n half
  • 1 teaspoon salt
  • 1 teaspoon pepper
  • 2 Tablespoons flour or cornstarch
  • 2 cups fried onions (such as French's)
  • 1/2 cup Parmesan cheese, grated (optional)

Instructions

    Cup of Yum
  1. In a large skillet, heat 4 Tablespoons of butter over medium-high heat. Add onions and cook until tender and caramelized, about 7-8 minutes, stirring often. Add mushrooms and cook for 4 minutes longer. Stir in garlic and cook for 1 minute. Transfer the mixture to a bowl. 
  2. After the onion-mushroom mixture has been removed, use the same skillet. Heat skillet to a medium heat and add remaining 4 Tablespoons of butter. Add flour or cornstarch and begin to quickly whisk the mixture. Let cook, whisking often, for about 2 minutes.  Stir in half-n-half, salt, and pepper. Cook for 4-5 minutes until mixture thickens. Taste and check for seasonings. 
  3. Preheat oven to 350 degrees. Bring a large pot of water to a boil. Add green beans and cook for 6-7 minutes.  Drain and transfer to ice bath to cool (optional).
  4. Add onion-mushroom mixture to cream sauce and stir. Add green beans and stir to coat. Sprinkle with parmesan cheese, if using. Pour into a 9 x 9 baking dish. Bake for 25 minutes or until bubbly.  Remove from the oven and cover with fried onions. Bake for 5 minutes longer. Serve immediately, if possible. 

Notes

  • May use fresh, frozen or canned green beans. If using canned green beans, they don't need to be cooked ahead of time. 
  • Don't use anything less than half-n-half in these green beans as it creates a thick sauce. 
  • If you want bite-size green beans, cut the fresh green beans in half.