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Make-Ahead Green Bean Casserole

Balanced, flavorful, and enjoyable—this recipe has it all.

Prep Time
15 mins
Cook Time
1 hr 15 mins
Total Time
1 hr 55 mins
Servings: 12 servings as a side dish
Calories: 270 kcal
Course: Side Dish
Cuisine: American

Ingredients

Topping:
  • 2 2 slices hearty sandwich bread white or wheat, torn into pieces
  • 2 2 tablespoons unsalted butter melted
  • ¼ ¼ teaspoon salt
  • 2 2 cups canned fried onions
Casserole:
  • 3 3 tablespoons unsalted butter
  • 10 10 ounces white mushrooms sliced thin
  • 1 1 teaspoon salt
  • ½ ½ teaspoon pepper
  • 6 6 garlic cloves minced
  • ½ ½ teaspoon dried thyme
  • ¼ ¼ cup all-purpose flour
  • 1 ¾ 1 ¾ cups low-sodium chicken broth
  • 1 ½ 1 ½ cups heavy cream
  • 2 2 pounds fresh green beans trimmed and cut into 1-inch pieces
  • ¼ ¼ cup cornstarch

Instructions

    Cup of Yum
  1. For the topping: Pulse bread, butter, and salt in food processor until coarsely ground. Combine bread mixture and canned fried onions in a bowl, transfer to a zipper-lock freezer bag, and freeze. (I placed the topping bag right on top of the casserole in the freezer so I could keep track of both.)
  2. For the casserole: Melt the butter in a large 12-inch skillet over medium heat. Add the mushrooms, salt, and pepper and cook until the mushrooms release their liquid, about 5 minutes. Increase the heat to medium-high and cook until all the liquid has evaporated, about 5 minutes. Add the garlic and thyme and cook until fragrant, about 30 seconds. Stir in the flour and cook until golden, stirring, about 1 minute. Slowly whisk in broth and cream and bring the mixture to a boil. Reduce the heat to medium and simmer, stirring occasionally, until the sauce has thickened, about 10 minutes.
  3. In a large bowl, toss the green beans with the cornstarch until the beans are evenly coated. Transfer the beans to a 9X13-inch baking dish. Pour the warm mushroom mixture evenly over the beans. Let the casserole cool completely on the counter. Once cooled, cover with a layer of plastic wrap and then a layer of foil. Freeze for up to 2 months.
  4. When ready to bake, adjust oven rack to the middle position and heat the oven to 400 degrees. Remove the layer of plastic wrap from the baking dish and replace the foil. Bake, covered, until the sauce is bubbling and the beans are tender, about 80 minutes, stirring the beans thoroughly after 50 minutes. Remove the foil and spread the frozen topping mixture over the beans. Bake until golden brown, about 8-10 minutes. Serve.

Notes

  • Freezable: the topping and casserole can be frozen separately for up to 2 months. Hallelujah!

Nutrition Information

Serving 1 Serving Calories 270kcal (14%) Carbohydrates 18g (6%) Protein 4g (8%) Fat 21g (32%) Saturated Fat 12g (60%) Cholesterol 53mg (18%) Sodium 369mg (15%) Fiber 3g (12%) Sugar 3g (6%)

Nutrition Facts

Serving: 12servings as a side dish

Amount Per Serving

Calories 270

% Daily Value*

Serving 1 Serving
Calories 270kcal 14%
Carbohydrates 18g 6%
Protein 4g 8%
Fat 21g 32%
Saturated Fat 12g 60%
Cholesterol 53mg 18%
Sodium 369mg 15%
Fiber 3g 12%
Sugar 3g 6%

* Percent Daily Values are based on a 2,000 calorie diet.