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Fresh Green Bean Casserole

A classic side dish made with fresh green beans and homemade mushroom sauce and onion topping.

Prep Time
20 mins
Cook Time
20 mins
Total Time
1 hr 10 mins
Servings: 8 servings
Calories: 350 kcal
Course: Side Dish
Cuisine: American

Ingredients

Onion Topping
  • 1 medium onion halved and sliced
  • 1 cup buttermilk
  • 1/3 cup all-purpose flour
  • 1/4 teaspoon kosher salt
  • 1/4 teaspoon black pepper
  • olive oil cooking spray
Mushroom Sauce
  • 2 pounds green beans trimmed and halved into smaller pieces
  • 3 tablespoons butter
  • 8 ounces cremini mushrooms quartered
  • 4 cloves garlic minced
  • 2 tablespoon all-purpose flour
  • 2 cups heavy cream
  • 1 1/2 teaspoons Italian seasoning
  • 1/2 teaspoon kosher salt
  • 1/2 teaspoon black pepper
  • 1/4 teaspoon ground nutmeg
  • 1/4 cup fresh parmesan cheese grated

Instructions

    Cup of Yum
  1. Preheat the oven to 400 degrees F. Line a large baking sheet with parchment paper and set aside.
  2. Combine onions and buttermilk in a medium bowl. Let soak for 15 minutes, then drain and discard the buttermilk.
  3. Return the drained onions to the bowl. Sprinkle them with flour, season with salt and pepper, and toss to coat.
  4. Transfer the onions to the prepared baking sheet. Coat them generously with cooking oil spray.
  5. Bake for 25-30 minutes, tossing once or twice, until tender and crisp. Set aside to cool slightly. Reduce the oven temperature to 375 degrees F.
Mushroom Sauce
    Cup of Yum
  1. While the onions are baking, make the casserole. Bring a large pot of water to boil. Cook green beans for 7-9minutes, until tender. Immediately drain the beans into a colander and set aside.
  2. In a skillet set over medium heat, melt the butter.
  3. Add the mushrooms and cook for 6-8 minutes, stirring occasionally, until golden brown and reduced in size. Add the garlic and cook for another 2 minutes.
  4. Sprinkle the flour over the mushrooms, stir, and cook for 2 minutes. Stir the heavy cream, Italian seasoning, salt, pepper, and nutmeg into the skillet and whisk well to combine. Continue cooking for about 5 minutes, until thickened. Remove from the heat, taste, and season with more salt and pepper, if desired.
  5. Transfer the green beans to a large bowl and toss with the Parmesan. Pour the mushroom sauce over the beans and toss to coat.
  6. Transfer the beans to the casserole dish and evenly distribute the onion topping over the top. Bake for 20-25 minutes, until the onions are golden and the sauce is bubbly.

Notes

  • Storing: Any leftover casserole can be stored in an airtight container in the fridge for 3-4 days. 
  • Any leftover casserole can be stored in an airtight container in the fridge for 3-4 days. 
  • Freezing: The best way to freeze fresh green bean casserole is uncooked and without the onion topping. Prepare the mushroom sauce and the green beans and place in a casserole dish. Tightly wrap the dish with plastic wrap, and then a layer of aluminum foil. Freeze for up to 6 months. 
  • The best way to freeze fresh green bean casserole is uncooked and without the onion topping. Prepare the mushroom sauce and the green beans and place in a casserole dish. Tightly wrap the dish with plastic wrap, and then a layer of aluminum foil. Freeze for up to 6 months. 
  • Reheating: To cook the frozen uncooked casserole, preheat the oven to 350F and cook for 45-60 minutes or until the casserole is warm through the center. Add the onion topping and bake for an additional 15 minutes or until the onion top is golden brown. 
  • To cook the frozen uncooked casserole, preheat the oven to 350F and cook for 45-60 minutes or until the casserole is warm through the center. Add the onion topping and bake for an additional 15 minutes or until the onion top is golden brown. 

Nutrition Information

Calories 350kcal (18%) Carbohydrates 20g (7%) Protein 7g (14%) Fat 28g (43%) Saturated Fat 18g (90%) Polyunsaturated Fat 1g Monounsaturated Fat 8g Trans Fat 1g Cholesterol 98mg (33%) Sodium 369mg (15%) Potassium 497mg (14%) Fiber 4g (16%) Sugar 6g (12%) Vitamin A 1870IU (37%) Vitamin C 16mg (18%) Calcium 173mg (17%) Iron 2mg (11%)

Nutrition Facts

Serving: 8servings

Amount Per Serving

Calories 350

% Daily Value*

Calories 350kcal 18%
Carbohydrates 20g 7%
Protein 7g 14%
Fat 28g 43%
Saturated Fat 18g 90%
Polyunsaturated Fat 1g 6%
Monounsaturated Fat 8g 40%
Trans Fat 1g 50%
Cholesterol 98mg 33%
Sodium 369mg 15%
Potassium 497mg 11%
Fiber 4g 16%
Sugar 6g 12%
Vitamin A 1870IU 37%
Vitamin C 16mg 18%
Calcium 173mg 17%
Iron 2mg 11%

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