Old-School Green Bean Casserole

Featured in: Comfort Food

This classic creamy green bean dish combines tender green beans with a savory mushroom and onion sauce, all topped with crispy fried onions for texture. The sauce is made by sautéing mushrooms and onions, thickening with a milk and cream blend, and seasoning with gentle spices. After mixing the beans with the sauce, it is baked until bubbling and golden, creating a comforting side dish ideal for festive occasions and family meals.

Updated on Mon, 08 Dec 2025 19:12:38 GMT
Creamy Old-School Green Bean Casserole topped with crispy fried onions for a holiday feast.  Pin
Creamy Old-School Green Bean Casserole topped with crispy fried onions for a holiday feast. | potfuljoy.com

Old-School Green Bean Casserole is a cherished classic that has graced holiday tables and family dinners for generations. This creamy, savory side dish features tender green beans enveloped in a rich mushroom sauce, topped with crispy fried onions for that perfect crunch. It’s both comforting and flavorful, making it an ideal accompaniment to festive meals.

Creamy Old-School Green Bean Casserole topped with crispy fried onions for a holiday feast.  Pin
Creamy Old-School Green Bean Casserole topped with crispy fried onions for a holiday feast. | potfuljoy.com

This casserole brings together simple ingredients to create a classic American side dish loved by many. The combination of fresh green beans, sautéed mushrooms and onions, and a creamy sauce makes it a versatile dish that pairs wonderfully with roast meats or can shine on its own.

Ingredients

  • 900 g (2 lb) fresh green beans, trimmed and cut into 5 cm (2-inch) pieces (or substitute with 900 g frozen cut green beans, thawed and drained)
  • 2 tbsp unsalted butter
  • 250 g (9 oz) cremini or button mushrooms, sliced
  • 1 small yellow onion, finely chopped
  • 2 garlic cloves, minced
  • 2 tbsp all-purpose flour
  • 240 ml (1 cup) whole milk
  • 120 ml (½ cup) heavy cream
  • 120 ml (½ cup) low-sodium vegetable broth
  • 1 tsp salt
  • ½ tsp black pepper
  • ½ tsp ground nutmeg (optional)
  • 150 g (1½ cups) crispy fried onions (store-bought or homemade)

Instructions

1. Preheat the oven to 180°C (350°F).
2. Bring a large pot of salted water to a boil. Add green beans and cook for 5 minutes until just tender but still bright green. Drain and immediately rinse under cold water to stop cooking. Set aside.
3. In a large skillet over medium heat, melt the butter. Add mushrooms and cook for 5-6 minutes until tender and browned. Add onion and garlic, cooking for another 2-3 minutes until softened.
4. Stir in the flour and cook for 1 minute, stirring constantly. Gradually whisk in milk, cream, and broth. Bring to a simmer and cook until thickened, about 5 minutes. Season with salt, pepper, and nutmeg (if using).
5. Add the drained green beans to the skillet and toss to coat evenly in the sauce.
6. Transfer the mixture to a 2-liter (2-quart) baking dish. Sprinkle half of the crispy fried onions on top.
7. Bake for 25 minutes until bubbling. Remove from oven, top with remaining onions, and bake for 5-7 minutes more until golden and crisp.
8. Let cool for 5 minutes before serving.

Zusatztipps für die Zubereitung

To enhance the sauce, consider stirring in 50 g of grated sharp cheddar or Gruyère cheese just before adding the green beans. This adds a deeper flavor and richer texture. For ease, you can prepare the casserole up to step 6, refrigerate it for up to 24 hours, then add the final topping and bake when ready to serve.

Varianten und Anpassungen

If fresh green beans are not available, frozen cut green beans work well when thawed and drained. For an extra nutty flavor, sprinkle a pinch of freshly ground nutmeg in the sauce. You may also make your own crispy fried onions at home for a more personalized touch.

Serviervorschläge

This casserole pairs beautifully with roast turkey or chicken, making it an ideal side for festive dinners and holiday feasts. It also matches well with other roasted meats or a hearty vegetarian main course.

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| potfuljoy.com

With its creamy texture and crispy topping, this Old-School Green Bean Casserole remains a beloved comfort food that brings warmth and nostalgia to any meal. Perfectly simple yet deeply satisfying, it continues to be a staple side dish that delights everyone at the table.

Recipe Q&A

How do I keep green beans tender and bright?

Boil the green beans briefly until just tender, then rinse with cold water to stop cooking and maintain their vibrant color.

Can I substitute fresh green beans with frozen ones?

Yes, thaw and drain frozen cut green beans before using to achieve similar texture and flavor.

What is the best way to get a creamy sauce?

Sauté mushrooms and onions, then whisk in flour followed by milk, cream, and broth, simmering until thickened.

How can I add more flavor to the sauce?

Stir in grated sharp cheddar or Gruyère cheese for extra richness and depth.

What gives the dish its crispy topping?

Crispy fried onions add a golden, crunchy finish when baked on top for the last few minutes.

Can I prepare this in advance?

Yes, assemble the dish up to adding onions and refrigerate for up to 24 hours; add onions and bake before serving.

Old-School Green Bean Casserole

Tender green beans in a creamy mushroom sauce topped with crispy fried onions.

Preparation time
15 min
Cooking time
35 min
Total time
50 min

Category Comfort Food

Difficulty Easy

Origin American

Yield 6 Servings

Dietary specifications Vegetarian

Ingredients

Vegetables

01 2 lb fresh green beans, trimmed and cut into 2-inch pieces (or 2 lb frozen cut green beans, thawed and drained)

Sauce Base

01 2 tablespoons unsalted butter
02 9 oz cremini or button mushrooms, sliced
03 1 small yellow onion, finely chopped
04 2 garlic cloves, minced
05 2 tablespoons all-purpose flour
06 1 cup whole milk
07 ½ cup heavy cream
08 ½ cup low-sodium vegetable broth
09 1 teaspoon salt
10 ½ teaspoon black pepper
11 ½ teaspoon ground nutmeg (optional)

Topping

01 1½ cups crispy fried onions (store-bought or homemade)

Instructions

Step 01

Preheat Oven: Preheat the oven to 350°F.

Step 02

Blanch Green Beans: Bring a large pot of salted water to a boil. Add green beans and cook for 5 minutes until tender but crisp. Drain and rinse under cold water to halt cooking. Set aside.

Step 03

Prepare Sauce Base: Melt butter in a large skillet over medium heat. Add mushrooms and sauté for 5-6 minutes until browned. Add onion and garlic; cook an additional 2-3 minutes until softened.

Step 04

Thicken Sauce: Stir in flour and cook for 1 minute, stirring constantly. Gradually whisk in milk, cream, and vegetable broth. Simmer for about 5 minutes until thickened. Season with salt, pepper, and nutmeg if desired.

Step 05

Combine Green Beans and Sauce: Add drained green beans to the skillet and toss gently to coat evenly with the sauce.

Step 06

Assemble Casserole: Transfer the green bean mixture to a 2-quart baking dish. Sprinkle half of the crispy fried onions evenly over the top.

Step 07

Bake Initial: Bake uncovered for 25 minutes until the mixture is bubbling.

Step 08

Add Remaining Topping and Bake: Remove from oven, add the remaining fried onions on top, and bake for an additional 5 to 7 minutes until golden and crisp.

Step 09

Rest Before Serving: Allow to cool for 5 minutes before serving to let flavors meld.

Required equipment

  • Large pot
  • Colander
  • Large skillet
  • Whisk
  • 2-quart baking dish
  • Oven

Allergen information

Review each ingredient to identify potential allergens and if uncertain, please consult a healthcare professional.
  • Contains milk (dairy), wheat (gluten in flour and fried onions), and possibly soy (in store-bought fried onions).

Nutritional values (per serving)

These values are provided as a general guide only and shouldn't replace professional medical advice.
  • Calories: 265
  • Fat: 15 g
  • Carbs: 25 g
  • Protein: 6 g