Southern Green Bean Casserole
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Southern Green Bean Casserole
This southern green bean casserole is the ultimate holiday classic made from scratch with earthy cremini mushrooms, garden-fresh green beans, and a velvety cream sauce. It comes together in just about an hour, making it the perfect centerpiece for your holiday table. This homemade green bean casserole delivers that beloved southern comfort food flavor with a comforting, crispy fried onion topping that will have everyone asking for seconds.
Every Thanksgiving, the aroma of this casserole baking transports me back to my grandmother’s kitchen. She believed the secret to any great side dish was building layers of flavor, starting with sautéed mushrooms and onions. I’ve carried on her tradition, and now this dish holds a place of honor right beside our perfect Thanksgiving turkey and Grandma’s classic stuffing. It’s a ritual that fills our home with warmth and anticipation.
Why This Casserole Becomes a Family Tradition
- Made From Scratch Flavor: The rich, creamy sauce is built on a buttery roux for authentic depth you can’t get from a can.
- Perfect Holiday Side Dish: Its make-ahead ease means less stress when hosting a traditional Thanksgiving dinner.
- Irresistible Texture Contrast: Tender-crisp green beans and a golden, crispy fried onion topping create the perfect bite.
- Crowd-Pleasing Comfort: This southern comfort food is always one of the first dishes to disappear from the table.
What You’ll Need for Homemade Southern Green Bean Casserole
Be sure to see the recipe card below for the full listing of ingredients, instructions, notes, and estimated nutritional information.
- Fresh Green Beans: Using two pounds of fresh beans gives you the best texture and vibrant color.
- Cremini Mushrooms: These earthy mushrooms add a profound, savory flavor that elevates the entire dish.
- Unsalted Butter: Building the roux with butter provides a rich, decadent base for your creamy sauce.
- All-Purpose Flour: This is essential for thickening the sauce to a luxuriously creamy consistency.
- Chicken Broth & Whole Milk: The combination creates a perfectly balanced and flavorful cream sauce.
- Crispy Fried Onions: Divided for baking, they create that iconic, irresistible crunchy topping.
Southern Green Bean Casserole
Classic Southern green bean casserole with cremini mushrooms, crispy fried onions, and a creamy sauce. Perfect holiday side dish ready in 60 minutes.
Equipment
- large pot
- oven
- large oven-safe skillet or Dutch oven
- 2-quart baking dish
- whisk
- cutting board
- knife
- measuring cups
- measuring spoons
Ingredients
Main Ingredients
- 2 pounds fresh green beans trimmed
- 4 tablespoons unsalted butter
- 8 ounces cremini mushrooms sliced
- 1/2 cup finely chopped yellow onion
- 2 cloves garlic minced
- 1/4 cup all-purpose flour
- 1 1/2 cups chicken broth
- 1 cup whole milk
- 1/2 teaspoon kosher salt
- 1/4 teaspoon black pepper
- 1 teaspoon Worcestershire sauce
- 6 ounces crispy fried onions divided
Instructions
- Preheat your oven to 375°F (190°C). Bring a large pot of generously salted water to a rolling boil. Add the trimmed green beans and cook for 5 to 7 minutes, or until they are tender-crisp and bright green. Drain the beans thoroughly and set them aside. This ensures they maintain a slight bite after baking.
- In a large oven-safe skillet or Dutch oven, melt the unsalted butter over medium heat. Add the sliced cremini mushrooms and chopped yellow onion. Sauté for 5 to 7 minutes, stirring occasionally, until the mushrooms are lightly browned and the onions are softened and translucent.
- Stir in the minced garlic and cook for 1 minute more, until it becomes fragrant. Sprinkle the all-purpose flour over the mushroom and onion mixture. Cook, stirring constantly, for 1 to 2 minutes to toast the flour and create a roux, which will thicken your sauce.
- Gradually whisk in the chicken broth until the mixture is smooth and lump-free, then slowly whisk in the whole milk. Bring the sauce to a gentle simmer, stirring continuously, and cook for 3 to 5 minutes until it thickens to a creamy consistency. Stir in the kosher salt, black pepper, and Worcestershire sauce. Taste and adjust seasonings as desired.
- Add the cooked green beans to the thickened sauce in the skillet and toss gently to coat them completely. Pour the green bean mixture into a 2-quart baking dish if your skillet isn’t oven-safe. Evenly sprinkle 2 ounces (about one-third) of the crispy fried onions over the top of the casserole.
- Bake in the preheated oven for 20 minutes, or until the casserole is bubbly around the edges and heated through.
- Remove the casserole from the oven. Sprinkle the remaining 4 ounces of crispy fried onions evenly over the top. Return the casserole to the oven and bake for an additional 5 to 10 minutes, or until the onions are golden brown and crispy. Let the casserole rest for 5 to 10 minutes before serving.
Notes
Let the casserole rest for 5 to 10 minutes before serving for easier scooping.
Simple Ways to Make It Your Own
- Make It Cheesier: Stir a half cup of shredded sharp cheddar cheese into the sauce before baking.
- Gluten-Free Version: Use a 1:1 gluten-free flour blend and certified GF crispy onions.
- Add a Smoky Twist: Incorporate a few slices of cooked, crumbled bacon for a smoky, savory note.
My Pro Tips for the Best Green Bean Casserole
- Don’t Overcook the Beans: Boil them just until tender-crisp so they retain a perfect bite after baking.
- Toast Your Roux: Cook the flour with the butter and mushrooms for a full minute to eliminate any raw flour taste.
- Season in Layers: Taste your sauce after adding the Worcestershire and adjust salt and pepper as needed.
- Double the Topping: For extra crunch, feel free to add an extra ounce or two of crispy fried onions. This pairs wonderfully with other textured sides like honey roasted carrots.
How to Store and Reheat Your Casserole
- Store: Cool completely, then transfer to an airtight container and refrigerate for up to 4 days.
- Freeze: Freeze the baked casserole (without the final onion topping) in a freezer-safe container for up to 3 months.
- Reheat: Bake from refrigerated at 350°F for 15-20 minutes, adding fresh crispy onions for the last 5 minutes.
- Make-Ahead Tip: Assemble the casserole a day ahead, cover, and refrigerate; add topping and bake before serving.
Frequently Asked Questions
Can I use frozen green beans instead of fresh?
Yes, you can use frozen green beans. Thaw them completely and pat them very dry to avoid a watery sauce. The texture will be slightly softer than with fresh beans, but it’s a great time-saver for easy Thanksgiving side dishes.
What can I use instead of cremini mushrooms?
White button mushrooms work perfectly well as a substitute. For a deeper flavor, you could use shiitake mushrooms, but I find creminis offer the ideal balance for this homemade green bean casserole.
How do I prevent the creamy sauce from being too thin?
Ensure you cook the roux for a full minute and let the sauce simmer until it visibly thickens before combining it with the beans. If it’s still thin, a tablespoon more flour mixed with a little broth can help thicken it.
Can I make this southern green bean casserole ahead of time?
Absolutely. Assemble the casserole completely, cover it tightly, and refrigerate it for up to 24 hours. Let it sit at room temperature for 30 minutes before baking, and add the final onion topping as directed.
More Holiday Side Dishes You’ll Adore
- Southern Sweet Potato Casserole
- Corn Casserole
- Garlic Mashed Potatoes
- Homemade Dinner Rolls
- Pumpkin Pie
- Homemade Apple Pie
Why This Southern Green Bean Casserole Will Impress
With its creamy, savory sauce and unforgettable crispy onion crunch, this from-scratch version is a true celebration of southern comfort food. It’s surprisingly simple to prepare and consistently earns rave reviews from family and friends. I hope this recipe becomes a cherished part of your holiday traditions, creating warm memories for years to come.
