This Green Bean Casserole is made with tender green beans in a creamy mushroom sauce and topped with crispy French fried onions. It bakes until golden and bubbling, costs just $1.08 per serving, and has been a classic side dish on our Thanksgiving table for years.
After 14 years of developing recipes, I know the classic holiday side dishes are always worth perfecting. This casserole is one my family would notice if it were missing from the Thanksgiving table. My kids love the crispy fried onion topping, and I love that I can assemble it up to 48 hours ahead and bake it the day of Thanksgiving.
Why You’ll Love This Recipe!
- Budget Friendly — $6.49 total for a classic holiday side dish
- Assemble up to 48 hours ahead and bake the day of
- Only 5 simple ingredients
- Perfect for any holiday meal and weeknight dinner
- Ready in just 50 minutes with almost zero active effort
This casserole is one of my favorite Thanksgiving Recipes. It has amazing flavor and the crispy texture topping makes it a must every holiday.
We also make this easy crock pot green bean casserole recipe if you prefer a slow cooker cooker version. You may also love Chicken Green Bean Casserole, Cheesy Corn Casserole, Green Bean Casserole with Bacon and Cheese or Green Been Bacon Casserole. You may even like this Scalloped Corn Recipe.
Ingredients
- Frozen green beans — the convenient year-round option that gives you consistent perfectly tender results every time. No trimming no washing no blanching required — they go straight from the freezer into the mixing bowl. Canned green beans work as a substitute — drain thoroughly before using. Fresh green beans work beautifully — blanch in boiling salted water for 3–4 minutes then transfer to ice water before using
- Cream of mushroom soup — two standard cans give you the perfect amount of rich creamy sauce base. Do not add water — use straight from the can for the thickest most flavorful result. Cream of chicken soup works as a mild substitute. Our Homemade Cream of Mushroom Soup Recipe gives an even richer result
- Milk — thins the condensed soup to the perfect creamy pourable consistency. Whole milk gives the richest result but any milk works
- Salt and black pepper — essential seasoning throughout. Always taste the sauce before adding the green beans and adjust — the cream of mushroom soup already adds significant saltiness so season carefully
- French fried onions — the most important ingredient in the entire casserole and what every family member reaches for first. Half goes into the casserole mixture for flavor throughout and half goes on top for that signature crispy golden finish. Always add the topping portion right before baking — never add ahead of time or they lose their crunch
How to Make Green Bean Casserole
Step 1 – Preheat the oven to 350 degrees F.
Step 2 – In a large mixing bowl, combine the cream of mushroom soup, ⅓ cup milk, salt and black pepper.
Step 3 – Stir in the cooked green beans and half of the french fried onions.
Step 4 – Pour this mixture in a baking dish.
Step 5 – Bake for about 30 minutes, stir the mixture and then top with the remaining crispy fried onions. Cooking time could vary.
Step 6 – Bake for 10 more minutes until hot and bubbling.
Step 7 – Serve and enjoy. It will smell amazing topped with parmesan cheese.
Tips for Success
- Never add the onion topping ahead of time. French fried onions absorb moisture rapidly in the refrigerator — always add right before baking for a truly crispy golden top
- Bake uncovered the entire time. Covering the casserole traps steam and makes the onion topping soggy instead of crispy — always bake uncovered from start to finish
- Stir before adding the final topping. Stirring at the 40-minute mark redistributes the sauce and ensures every green bean is evenly coated before the crispy topping goes on
- Let it rest before serving. Five minutes of resting allows the sauce to set slightly so the casserole scoops cleanly rather than running all over the plate
- Taste the sauce before baking. The cream of mushroom soup is already salted — always taste the mixture before pouring into the baking dish and adjust salt and pepper to your preference
How to Prepare Ahead of Time
This is the most practical holiday tip in this entire post — here is exactly how to do it:
Up to 48 hours ahead — combine the green beans and mushroom sauce mixture in the baking dish cover tightly with plastic wrap and refrigerate. Do not add any French fried onions at this stage.
30 minutes before baking — remove the dish from the refrigerator and let it sit at room temperature. Add the first half of the French fried onions on top.
Baking from cold — add 10–15 extra minutes to the initial baking time since the casserole will be cold from the refrigerator. Watch for the sauce to be actively bubbling around the edges before adding the final onion topping.
Best result — making this the night before gives you a casserole that has had time for all the flavors to meld together overnight and is actually more flavorful than one assembled and baked the same day.
Potluck – Bringing This to a Gathering Prepare the casserole as directed, but stop before the final 10 minutes of baking (skip the last onion topping for now). Cover with foil, wrap the dish in a towel to help retain heat, and transport in an insulated bag or cooler. Once you arrive, top with the remaining onions and finish baking until hot and bubbly.
Variations and Substitutions
- Green Beans – Fresh or canned both work as substitutes for frozen. Canned green beans should be drained thoroughly before using. Fresh green beans should be blanched in boiling salted water for 3–4 minutes then shocked in ice water and dried completely before adding to the casserole.
- Crispy Topping – French fried onions are the classic choice but panko breadcrumbs tossed with a tablespoon of melted butter give a lighter crunchier result. A combination of both is our favorite — onions for flavor and panko for extra crunch.
- Cream of Mushroom Soup – Cream of chicken soup gives a milder less earthy flavor that kids sometimes prefer.
- Add Cheese – Stir 1 cup of shredded cheddar cheese into the green bean mixture before pouring into the baking dish for a cheesy casserole that the whole family goes crazy for.
- Add Bacon – Stir 4–6 slices of cooked crumbled bacon into the mixture for a smoky savory twist — see our Green Bean Casserole with Bacon and Cheese for the full version.
- Soy Sauce – Add 1 teaspoon of soy sauce to the sauce mixture for extra savory depth — readers of similar recipes consistently credit this small addition as the secret to making the dish taste even better.
- Nutmeg – Add a pinch of freshly grated nutmeg to the sauce mixture for a subtle, warm background flavor — a classic addition in some traditional versions of this dish.
Topping Ideas
- Parmesan cheese — sprinkle over the top before the final 10 minutes for a golden cheesy finish
- Crushed crackers — use crushed Ritz crackers instead of French fried onions for a buttery crumbly topping
- Slivered almonds — add alongside the onions for extra crunch and a nutty flavor
What to Serve with Green Bean Casserole
- Roast Turkey — the most classic Thanksgiving pairing. Green bean casserole has been on the American holiday table alongside roast turkey for generations
- Slow Cooker Turkey Breast — a smaller more manageable turkey option that pairs beautifully with this classic side
- Crock Pot Spiral Ham — serve alongside for a complete Christmas or Easter holiday spread
- Crockpot Mashed Potatoes — make in the slow cooker so the oven stays free for the casserole and the turkey
Storage and Freezer Instructions
Refrigerator
- Store in an airtight container for up to 3–4 days. The onion topping will soften during storage but can be refreshed by reheating in a 350°F oven for 10 minutes uncovered
Freezer
- Freeze the casserole without the French fried onion topping for up to 3 months. Thaw overnight in the refrigerator then add fresh onion topping and bake at 350°F for 20–25 minutes until heated through and the topping is crispy
Reheating
- Reheat individual portions in the microwave in 30-second intervals until warmed through — or reheat the entire casserole uncovered in a 350°F oven for 10 minutes until hot and bubbling. The oven method gives a significantly crispier onion topping than the microwave
Frequently Asked Questions
Yes — assemble without the French fried onion topping cover tightly and refrigerate for up to 48 hours. Add the first half of the onions right before baking and add 10–15 extra minutes to the bake time since the casserole will be cold.
Frozen green beans are the most convenient and give the most consistent result — canned beans work well if drained thoroughly and fresh beans give the most vibrant flavor if you have time to blanch them first.
Canned green beans were not drained thoroughly enough or the cream of mushroom soup was diluted with too much milk — always drain canned beans completely and use only ½ cup of milk for the right creamy consistency.
Yes — use our Homemade Cream of Mushroom Soup as a direct substitute for a from-scratch version that is richer and more flavorful than the canned version.
Always add the topping right before baking never ahead of time and always bake uncovered — moisture is what makes the topping soggy so keeping it away from the casserole until the last possible moment is the key.
Yes — double all the ingredients and use a 9×13-inch baking dish instead of a smaller casserole dish. Add about 10-15 extra minutes to the initial bake time before adding the final onion topping.
More Thanksgiving Side Dish Recipes
If you make this classic green bean casserole, make sure to leave us a comment. We love hearing from you.
Easy Green Bean Casserole
Ingredients
- 24 oz Frozen Green Beans
- 2 cans of Cream of Mushroom Soup
- ½ cup Milk
- ½ tsp Salt
- ½ tsp Pepper
- 6 oz can of French Fried Onions
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Instructions
- Preheat the oven to 350 degrees F.
- In a large mixing bowl, combine the cream of mushroom soup, milk, salt and pepper.
- Stir in the green beans and half of the french fried onions.
- Pour this mixture in a casserole dish.
- Bake for 30 minutes, stir the mixture and then top with the remaining french fried onions.
- Bake for 10 more minutes.
- Serve and enjoy!
Everyone loved this recipe and it’s so easy!!!! thank you so much!
Susan – I’m so glad to hear that! Thank you so much for sharing and for the positive review!
I receive some of your recipes but want more!
Awwww!!! Thank you so much Bettina! That means so much to me! I hope you check out my main website eatingonadime.com and find more recipes you would like to try!
I make this every Thanksgiving. My family loves it. Your recipes are delicious. Mary Jean Massaro.
Mary Jean – I’m so glad everyone loves it. Thanks for commenting!
We love this with canned green beans. Much better texture in our opinion.