We present to you the Best-Ever Green Bean Casserole With Step-by-Step Video. This delightful dish elevates the classic green bean casserole with a rich homemade Parmesan cream sauce, complemented by savory caramelized crimini mushrooms and fresh green beans. Perfect for holidays or family gatherings, this casserole guarantees to impress your guests with its unique flavors and textures while remaining a comforting staple.
Why You’ll Love This Recipe
- Delicious Flavor: The homemade Parmesan cream sauce combined with caramelized mushrooms enhances the taste of fresh green beans.
- Easy Preparation: With clear step-by-step instructions, you’ll find that making this casserole is straightforward and manageable.
- Versatile Dish: This recipe is perfect for Thanksgiving, Christmas, or any festive gathering, making it a year-round favorite.
- Crowd-Pleaser: Serving this dish will surely earn you compliments from friends and family, as it’s both visually appealing and delicious.
- Comfort Food Classic: It adds a touch of nostalgia while also offering a gourmet twist that everyone will love.
Tools and Preparation
Before getting started, gather your essential tools. Having the right equipment makes cooking easier and more enjoyable.
Essential Tools and Equipment
- Large pot
- Skillet
- Baking dish (2-quart)
- Whisk
- Measuring cups and spoons
Importance of Each Tool
- Large pot: Ideal for boiling the green beans evenly without overcrowding.
- Skillet: Perfect for caramelizing mushrooms to bring out their deep flavor.
- Baking dish: Ensures even cooking and easy serving of your casserole.

Ingredients
We turned up the dial on green bean casserole with a homemade Parmesan cream sauce, savory caramelized mushrooms, and fresh green beans. French’s onions stay.
For the Casserole
- 2 lb. fresh green beans
- Kosher salt
- 2 Tbsp. extra-virgin olive oil, divided
- 1 lb. crimini mushrooms, sliced, divided
- 6 Tbsp. unsalted butter, divided
- 4 large sprigs thyme, divided
For the Cream Sauce
- 2 Tbsp. all-purpose flour
- 1¼ cups whole milk
- 1 cup heavy cream
- 4 cloves garlic, finely grated
- ½ cup grated Parmesan
- Freshly ground black pepper
For Topping
- ¾ cup French’s fried onions
How to Make Best-Ever Green Bean Casserole With Step-by-Step Video
Step 1: Preheat the Oven
Preheat your oven to 375°F (190°C). Ensure the rack is in the middle position to allow for even cooking.
Step 2: Prepare the Green Beans
- Bring a large pot of salted water to a boil.
- Cook 2 lb. fresh green beans in batches until bright green and halfway tender, about 3 minutes per batch.
- Drain the beans and let them cool before trimming the stem ends.
Step 3: Caramelize the Mushrooms
- Heat 1 Tbsp. extra-virgin olive oil in a large skillet over medium-high heat.
- Add ½ lb. sliced crimini mushrooms without stirring; let them brown for about 2 minutes.
- Toss and cook until browned on both sides (about 3 minutes more).
- Add 2 Tbsp. unsalted butter and 2 thyme sprigs; cook until butter browns and mushrooms are tender (about 4 minutes), then season with kosher salt.
- Transfer to a plate and repeat with remaining ingredients.
Step 4: Make the Cream Sauce
- In a large saucepan over medium-low heat, melt remaining 2 Tbsp. unsalted butter.
- Whisk in all-purpose flour; cook until roux is golden brown (about 4 minutes).
- Gradually whisk in whole milk and heavy cream; increase heat to bring mixture to a simmer while whisking often.
- Cook until sauce thickens and bubbles (about 5 minutes). Remove from heat; whisk in finely grated garlic cloves and grated Parmesan cheese; season with salt and pepper.
Step 5: Assemble the Casserole
- In a baking dish, arrange layers of green beans and caramelized mushrooms.
- Pour sauce over vegetables (it may seem insufficient but will thicken when baked).
- Cover tightly with foil; bake until bubbling (25–30 minutes).
- Uncover; bake until lightly browned on top (15–20 minutes more).
- Top with French’s fried onions; bake until onions are fragrant (about 3 minutes).
Let sit for 10 minutes before serving! Enjoy your delectable Best-Ever Green Bean Casserole!
How to Serve Best-Ever Green Bean Casserole With Step-by-Step Video
This delightful green bean casserole is a perfect addition to any meal, especially during festive gatherings. It pairs wonderfully with a variety of dishes and can be served in several creative ways.
With Crispy Topping
- Top your casserole with additional French’s fried onions for an extra crunch that enhances the texture and flavor.
As a Main Dish
- Serve it as a standalone dish for a light lunch or dinner, accompanied by a fresh salad to balance the richness of the creamy sauce.
With Toasted Bread
- Pair it with toasted baguette slices or garlic bread to soak up the delicious cream sauce, making every bite satisfying.
Family Style Serving
- Present the casserole in a large dish on the table, allowing guests to help themselves. This adds a warm, inviting touch to your dining experience.
In Individual Portions
- For a more elegant serving option, divide the casserole into individual ramekins, perfect for special occasions or dinner parties.
How to Perfect Best-Ever Green Bean Casserole With Step-by-Step Video
Achieving the best results for your green bean casserole is all about attention to detail. Here are some tips to elevate your dish:
- Use Fresh Beans: Opt for fresh green beans instead of canned ones for better texture and flavor.
- Caramelize Mushrooms Well: Take the time to fully caramelize your mushrooms; this enhances their earthy flavor and adds depth to the dish.
- Don’t Rush the Roux: Allow the roux (flour and butter mixture) to turn golden brown before adding liquids; this adds nuttiness.
- Adjust Consistency: If you prefer a thicker sauce, let it simmer longer until it reaches your desired consistency before combining with beans.
- Let it Rest: Allow the casserole to sit for about 10 minutes after baking; this helps it set and makes serving easier.
Best Side Dishes for Best-Ever Green Bean Casserole With Step-by-Step Video
Complementing your green bean casserole with well-chosen sides can enhance your meal. Here are some great options:
- Roasted Sweet Potatoes – Their natural sweetness contrasts beautifully with the savory flavors of the casserole.
- Garlic Mashed Potatoes – Creamy mashed potatoes add comfort and pair perfectly with rich dishes.
- Quinoa Salad – A refreshing quinoa salad with lemon dressing provides a light counterpoint to heavy casseroles.
- Cranberry Sauce – The tartness of cranberry sauce balances out the richness of creamy dishes like this casserole.
- Buttery Corn on the Cob – Sweet corn adds vibrant color and sweetness, making it an appealing side.
- Cauliflower Gratin – This cheesy side complements the creaminess of green bean casserole while adding another layer of flavor.
Common Mistakes to Avoid
Making green bean casserole can be simple, but several common mistakes can lead to less-than-perfect results. Here are some tips to help you avoid them.
- Overcooking the Green Beans: Cooking the beans too long in boiling water can make them mushy. Blanch them for just 3 minutes to keep that crunchy texture.
- Skipping the Caramelization of Mushrooms: Failing to properly caramelize the mushrooms can result in a bland flavor. Take your time and let them brown well for the best taste.
- Not Seasoning the Sauce: Forgetting to add salt and pepper to the cream sauce can leave your casserole flat. Taste and adjust seasoning as needed.
- Using Cold Ingredients: Starting with cold milk or cream can affect how smoothly your sauce comes together. Make sure all dairy ingredients are at room temperature.
- Baking Without Foil: Baking without covering your casserole may lead to a dry dish. Cover it tightly with foil until the final browning stage.

Storage & Reheating Instructions
Refrigerator Storage
- Store leftover casserole in an airtight container for up to 3-4 days.
- Let the casserole cool completely before sealing it to avoid condensation.
Freezing Best-Ever Green Bean Casserole With Step-by-Step Video
- Freeze in an airtight container or heavy-duty freezer bag for up to 2 months.
- For best results, freeze before baking, then thaw overnight in the fridge before cooking.
Reheating Best-Ever Green Bean Casserole With Step-by-Step Video
- Oven: Preheat oven to 350°F (175°C). Cover with foil and bake for about 25 minutes or until heated through.
- Microwave: Place in a microwave-safe dish and cover loosely. Heat on medium power for 5-7 minutes, stirring halfway through.
- Stovetop: Transfer portions to a skillet over medium heat. Stir occasionally until heated through.
Frequently Asked Questions
Here are some common questions about making the Best-Ever Green Bean Casserole With Step-by-Step Video.
Can I make this casserole ahead of time?
Yes! You can prepare it a day ahead, store it in the refrigerator, and bake it when ready to serve.
What type of green beans should I use?
Fresh green beans work best for this recipe, but you can also use frozen if fresh isn’t available.
Can I customize this recipe?
Absolutely! Feel free to add cooked chicken or turkey for added protein or mix in other vegetables like corn or carrots.
How do I ensure my sauce is smooth?
Whisk vigorously while combining flour with butter and dairy ingredients. This will help prevent lumps from forming.
Is this recipe suitable for special occasions?
Yes! The Best-Ever Green Bean Casserole is perfect for holidays and gatherings, adding gourmet flair to any meal.
Final Thoughts
The Best-Ever Green Bean Casserole is a delightful twist on a classic dish, boasting rich flavors from homemade Parmesan cream and caramelized mushrooms. Its versatility allows you to customize it with your favorite ingredients or serve it as a standout side at any gathering. Give this recipe a try — it’s sure to impress family and friends alike!
Best-Ever Green Bean Casserole
- Total Time: 1 hour 10 minutes
- Yield: Serves approximately 6 people 1x
Description
Indulge in the Best-Ever Green Bean Casserole, a delightful twist on the classic dish that enhances your holiday gatherings or family dinners. This recipe features fresh green beans smothered in a rich homemade Parmesan cream sauce, complemented by savory caramelized crimini mushrooms and topped with crispy French’s fried onions. Not only is this casserole easy to prepare with step-by-step instructions, but it also promises to impress your guests with its gourmet flavors and comforting textures. Whether for Thanksgiving, Christmas, or any festive occasion, this crowd-pleaser will surely become a staple at your table.
Ingredients
- 2 lb. fresh green beans
- 1 lb. crimini mushrooms, sliced
- 6 Tbsp. unsalted butter, divided
- 2 Tbsp. extra-virgin olive oil, divided
- 2 Tbsp. all-purpose flour
- 1¼ cups whole milk
- 1 cup heavy cream
- 4 cloves garlic, finely grated
- ½ cup grated Parmesan
- ¾ cup French's fried onions
- Freshly ground black pepper
- Kosher salt
- 4 large sprigs thyme
Instructions
- Preheat oven to 375°F (190°C) and prepare a baking dish.
- Boil green beans in salted water for about 3 minutes until bright green; drain and cool.
- In a skillet, sauté mushrooms with olive oil and butter until caramelized.
- Make the cream sauce by whisking flour into melted butter, then gradually adding milk and cream while cooking until thickened. Stir in garlic and Parmesan.
- Layer green beans and mushrooms in the baking dish, pour sauce over, cover with foil, and bake for 25–30 minutes until bubbling.
- Remove foil, add fried onions on top, and bake uncovered for an additional 15–20 minutes.
- Prep Time: 20 minutes
- Cook Time: 50 minutes
- Category: Side Dish
- Method: Baking
- Cuisine: American
Nutrition
- Serving Size: 1 cup (240g)
- Calories: 320
- Sugar: 3g
- Sodium: 450mg
- Fat: 22g
- Saturated Fat: 12g
- Unsaturated Fat: 8g
- Trans Fat: 0g
- Carbohydrates: 25g
- Fiber: 5g
- Protein: 7g
- Cholesterol: 45mg