Classic green bean casserole combines tender green beans with creamy mushroom sauce and a crisp fried onion topping. It is a familiar American side dish often served with Thanksgiving turkey, holiday ham, or a traditional Sunday dinner.
This easy version uses canned green beans and condensed cream of mushroom soup, keeping preparation to about 10 minutes. Some of the fried onions are mixed into the casserole for flavor, while the rest are added near the end so they stay crisp.
The casserole can be assembled ahead of time and baked shortly before serving, making it particularly convenient for busy holiday meals.
Why You’ll Love This Recipe
- Preparation takes only about 10 minutes.
- It uses familiar, widely available ingredients.
- The creamy filling and crisp onion topping provide contrasting textures.
- It can be assembled ahead of time.
- The recipe is easy to double for a larger gathering.
- It pairs with turkey, ham, chicken, beef, and other main dishes.
Ingredients
- 2 cans (14.5 ounces each) cut green beans: Drain them thoroughly to prevent a watery casserole.
- 1 can (10.5 ounces) condensed cream of mushroom soup: Creates the creamy sauce.
- 3/4 cup whole milk: Loosens the condensed soup to the proper consistency.
- 1 teaspoon soy sauce: Adds savory depth without making the casserole taste strongly of soy.
- 1/4 teaspoon ground black pepper: Adds mild warmth.
- 1 1/3 cups crispy fried onions, divided: Some flavor the filling, while the remainder creates the crunchy topping.
Ingredient Substitutions
- Canned green beans: Use 1 1/2 pounds of fresh green beans or 24 ounces of frozen green beans.
- Whole milk: Two-percent milk or half-and-half can be used. Half-and-half produces a richer sauce.
- Cream of mushroom soup: Substitute condensed cream of chicken or cream of celery soup.
- Soy sauce: Worcestershire sauce can be used for a slightly different savory flavor.
- Crispy fried onions: Use crushed butter crackers mixed with melted butter, although the flavor will differ.
- Black pepper: White pepper can be used if you prefer not to see dark specks in the sauce.
If using fresh green beans, trim and cut them into bite-sized pieces. Boil them for 5 minutes, then drain and cool them before assembling the casserole. Frozen green beans should be thawed and patted dry.
How to Make Green Bean Casserole
- Preheat the oven.
Preheat the oven to 350°F. Lightly grease a 1 1/2- to 2-quart baking dish. - Drain the green beans.
Pour the canned green beans into a colander and let them drain thoroughly. Gently shake away excess liquid so it does not dilute the sauce. - Prepare the mushroom sauce.
Add the condensed cream of mushroom soup, milk, soy sauce, and black pepper to the baking dish. Whisk or stir until the mixture is smooth. - Add the green beans.
Fold the drained green beans into the sauce until they are evenly coated. - Add some of the fried onions.
Stir 2/3 cup of the crispy fried onions into the green bean mixture. Spread the casserole into an even layer. - Bake the casserole.
Bake uncovered for 25 minutes. The sauce should be hot and bubbling around the edges. - Add the remaining onions.
Carefully stir the casserole, then sprinkle the remaining 2/3 cup fried onions evenly over the top. - Finish baking.
Return the casserole to the oven for 5 minutes. The onions should be golden and crisp. Watch them closely because they can darken quickly. - Rest before serving.
Let the casserole stand for 5 minutes. This allows the sauce to thicken slightly before serving.
Tips for the Best Classic Green Bean Casserole
- Drain canned green beans thoroughly so the sauce remains creamy.
- Whisk the soup and milk together before adding the beans.
- Mix only half of the fried onions into the filling and reserve the rest for the topping.
- Bake the casserole uncovered so excess moisture can evaporate.
- Add the final onion layer during the last five minutes to prevent burning.
- Use an appropriately sized baking dish so the casserole heats evenly.
- Let it rest briefly before serving so the sauce can settle.
Common Mistakes to Avoid
Failing to Drain the Green Beans
Excess liquid can make the mushroom sauce watery. Let the beans drain while preparing the other ingredients.
Adding All the Fried Onions at the Beginning
The onions on top can become too dark during the full baking time. Reserve half and add them near the end.
Using Too Much Milk
Condensed soup requires only enough milk to create a creamy sauce. Additional milk can make the casserole loose.
Covering the Casserole While Baking
Covering traps steam and can produce a softer, more watery result. Bake it uncovered.
Walking Away After Adding the Topping
Fried onions can burn quickly. Check the casserole during the final few minutes.
Variations
Cheesy Green Bean Casserole
Stir 1 cup of shredded sharp cheddar cheese into the filling before baking. Sprinkle another 1/4 cup over the casserole with the final onion topping.
Bacon Green Bean Casserole
Add 6 slices of cooked, crumbled bacon to the green bean mixture. Reserve a small amount for garnishing.
Garlic Mushroom Casserole
Sauté 8 ounces of sliced mushrooms with 2 minced garlic cloves in 1 tablespoon butter. Fold them into the filling before baking.
Spicy Green Bean Casserole
Add 1/4 teaspoon cayenne pepper or several dashes of hot sauce to the mushroom sauce.
Fresh Green Bean Casserole
Replace the canned beans with 1 1/2 pounds of trimmed fresh green beans. Boil them for 5 minutes, transfer them to ice water, and drain thoroughly before assembling.
What to Serve With Classic Green Bean Casserole
- Roast turkey
- Glazed ham
- Roast chicken
- Classic beef pot roast
- Mashed potatoes
- Southern-style cornbread or dinner rolls
How to Store
Allow the casserole to cool before transferring it to an airtight container. Refrigerate for 3 to 4 days.
Reheat leftovers in a 350°F oven for 15 to 20 minutes. Add a small handful of fresh fried onions during the final five minutes to restore some crunch. Individual portions can also be microwaved, although the topping will become softer.
Freezing is possible, but the sauce and green beans may develop a softer texture. For better results, assemble and freeze the casserole without the fried onion topping for up to 2 months. Thaw it overnight in the refrigerator, bake until hot, and add fresh onions near the end.
Frequently Asked Questions
Can I use fresh green beans?
Yes. Trim and cut 1 1/2 pounds of fresh green beans, boil them for 5 minutes, and cool them in ice water. Drain thoroughly before using.
Can I use frozen green beans?
Yes. Thaw 24 ounces of frozen green beans and pat them dry before adding them to the sauce.
Can I make green bean casserole ahead of time?
Yes. Assemble the casserole without the fried onion topping and refrigerate it for up to one day. Add several minutes to the initial baking time, then top it with the onions.
Why is my green bean casserole watery?
The beans may not have been drained thoroughly, or too much milk may have been added. Measure the milk and remove as much moisture as possible from the beans.
Can I double the recipe?
Yes. Double the ingredients and use a 9-by-13-inch baking dish. The casserole may need an additional 5 to 10 minutes before the final topping is added.
How can I keep the fried onions crisp?
Reserve half of the onions for the final five minutes of baking. Do not cover the casserole after it leaves the oven.
Can I prepare this without cream of mushroom soup?
Yes, but you will need approximately 2 cups of thick homemade mushroom cream sauce to replace the condensed soup and milk.
Final Thoughts
Classic green bean casserole is an easy side dish with tender beans, creamy mushroom sauce, and crisp fried onions. Draining the beans well and adding the final onion layer near the end are the most important steps for achieving the proper consistency and texture.