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Green bean casserole with fresh green beans, creamy mushroom sauce and crispy fried onions

Green Bean Casserole with Fresh Green Beans

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Prep Time 15 minutes
Cook Time 35 minutes
Total Time 50 minutes
Servings: 8
Course: Side Dish
Cuisine: American
Ingredients Method Notes

Ingredients
  

  • 1 1/2 pounds fresh green beans trimmed and cut in half
  • 2 tablespoons butter
  • 8 ounces mushrooms sliced
  • 1 small onion finely diced
  • 2 cloves garlic minced
  • 3 tablespoons all-purpose flour
  • 1 1/2 cups whole milk
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
  • 1 1/2 cups crispy fried onions divided

Method
 

  1. Preheat oven to 350°F (175°C). Lightly grease a 9x13-inch baking dish.
  2. Bring a large pot of salted water to a boil. Add green beans and cook 4 to 5 minutes until bright green and just tender. Drain, rinse under cold water or ice bath, and set aside.
  3. Melt butter in a large skillet over medium heat. Add mushrooms and onion. Cook 6 to 8 minutes, stirring often, until golden and soft.
  4. Stir in garlic and cook 30 seconds. Sprinkle flour over the mixture and stir well. Cook 1 minute, stirring constantly.
  5. Slowly pour in milk while stirring. Simmer 3 to 4 minutes until thickened. Stir in salt and pepper.
  6. Add green beans to the sauce and stir to coat. Fold in 3/4 cup crispy fried onions. Pour into the baking dish and spread evenly.
  7. Bake 20 to 25 minutes until bubbling around the edges.
  8. Sprinkle remaining 3/4 cup fried onions on top. Bake 5 more minutes until golden. Rest 5 minutes before serving.

Notes

Blanching keeps the beans bright green and crisp. Add the final onion topping only in the last 5 minutes so it stays crunchy. Assemble up to 24 hours ahead (without topping) and refrigerate until baking.