Green Bean Casserole with Crispy Fried Onions on Top
Green bean casserole is a baked side dish made with tender green beans, a creamy mushroom sauce, and a crunchy fried onion topping. It comes together in one dish and feeds a crowd without much fuss.
You just need green beans, mushroom sauce, and those crispy onions, about 45 minutes total, perfect for Thanksgiving or any weeknight dinner. Save it for later!
| Prep | Cook | Total | Servings | Difficulty |
|---|---|---|---|---|
| 15 min | 30 min | 45 min | 8 servings | Advanced |
Why You'll Love This Recipe
- One dish wonder: everything bakes together, so cleanup takes minutes.
- Make-ahead friendly: assemble it the day before and bake when you're ready.
- Budget stretcher: simple pantry ingredients feed six to eight people easily.
- Kid approved: the crunchy onion topping gets even picky eaters to finish their plate.
- Holiday staple: it's the dish everyone expects to see on the Thanksgiving table.
Green Bean Casserole Ingredients
- Green beans: fresh or frozen both work, but fresh gives a firmer bite. Canned beans work in a pinch, just drain them well.
- Mushrooms: cremini or white button mushrooms add an earthy depth to the sauce. Sautéing them first concentrates their flavor.
- Butter: builds the base of the sauce and browns the mushrooms nicely. Swap in olive oil for a lighter touch.
- Flour: thickens the sauce so it holds together instead of running thin.
- Chicken broth or vegetable broth: adds savory depth to the cream base. Use low-sodium so you can control the salt.
- Heavy cream: gives the sauce its rich, smooth texture. Half-and-half works if you want something lighter.
- Soy sauce with a splash of rice vinegar: stands in for Worcestershire sauce, which often contains anchovies and malt vinegar, and gives the same savory tang.
- Crispy fried onions: the signature topping. Store-bought is classic, or make your own at home.
See the recipe card below for exact amounts.
Ways to Change It Up
- Protein boost: stir in cooked turkey bacon bits or shredded rotisserie chicken for a heartier dish.
- Seasonal veggies: swap half the green beans for roasted butternut squash in the fall.
- Spice it up: add a pinch of cayenne or a few dashes of hot sauce to the mushroom sauce.
- Lighter version: use low-fat milk instead of heavy cream and bake with less cheese.
- Slow cooker method: combine everything except the onions and cook on low for 3 hours, then top and broil briefly.
If beans are your thing, you might also like French Onion Beans (https://hellarecipe.com/french-onion-beans/) or Tomato & Basil White Beans (https://hellarecipe.com/tomato-basil-white-beans/) for more weeknight sides.
How to Make Green Bean Casserole
- Blanch the beans: boil the green beans for 4-5 minutes until bright green and just tender, then drain.
- Build the sauce: sauté mushrooms in butter until golden, about 6 minutes, then whisk in flour, broth, and cream until thickened.
- Combine: fold the blanched beans into the sauce along with the soy sauce mixture and half the crispy onions.
- Bake: pour everything into a greased baking dish and bake at 350°F for 25 minutes, until bubbling at the edges.
- Top and finish: scatter the remaining fried onions on top and bake 5 more minutes, until golden and crisp.
- Rest and serve: let the casserole sit for 5 minutes before serving so the sauce sets slightly.
Pro Tips from Our Kitchen
- Don't skip blanching: raw green beans won't cook through in the oven time, so this step is essential.
- Sauté mushrooms dry first: letting their liquid evaporate before adding butter gives a deeper, browned flavor.
- Add onions in two stages: mixing some in and saving some for the top keeps every bite crunchy.
- Watch the bake time: if the top browns too fast, tent loosely with foil for the last few minutes.
- Taste before baking: the sauce should taste slightly salty on its own since the beans mellow it out.
What to Serve With It
This casserole pairs naturally with roasted meats and other Thanksgiving sides. Try it alongside Maple Roasted Sweet Potatoes (https://hellarecipe.com/maple-roasted-sweet-potatoes-easy-thanksgiving-side-dish/) or Sweet Potato Casserole with Maple Pecan (https://hellarecipe.com/sweet-potato-casserole-with-maple-pecan-2/) for a full holiday spread. A simple green salad or warm dinner rolls round things out nicely.
Storage and Reheating
Store leftovers in an airtight container in the fridge for up to 4 days. Freeze the baked casserole (without fresh onions on top) for up to 2 months; thaw overnight in the fridge before reheating. Warm at 350°F for 15-20 minutes, adding fresh crispy onions on top in the last 5 minutes to restore the crunch.
Green Bean Casserole FAQ
Can I use canned green beans?
Yes, drain them well and skip the blanching step since they're already cooked.
Can I make it ahead of time?
Assemble the casserole without the onion topping up to a day ahead, cover, and refrigerate. Add the onions right before baking.
Do I need a baking dish or can I use a skillet?
A 9×13-inch baking dish works best for even cooking, though an oven-safe skillet works if you don't mind a deeper layer.
Green Bean Casserole with Crispy Fried Onions on Top
Ingredients
Method
- Blanch the green beans: Bring a large pot of salted water to a boil and add the green beans. Cook for 4-5 minutes until bright green and just tender, then drain and set aside.
- Preheat the oven: Set your oven to 350°F so it's ready when the casserole is assembled.
- Sauté the mushrooms: Melt the butter in a large skillet over medium heat and add the mushrooms. Cook for 6-7 minutes, stirring occasionally, until golden and most of their liquid has evaporated.
- Add garlic: Stir in the minced garlic and cook for 30 seconds until fragrant, being careful not to let it burn.
- Make the roux: Sprinkle the flour over the mushrooms and stir constantly for 1 minute to cook off the raw flour taste.
- Build the sauce: Slowly whisk in the chicken broth, followed by the heavy cream. Cook for 4-5 minutes, stirring often, until the sauce thickens enough to coat the back of a spoon.
- Season the sauce: Stir in the soy sauce, rice vinegar, salt, and black pepper. Taste and adjust seasoning as needed.
- Combine beans and sauce: Add the blanched green beans and half of the crispy fried onions to the mushroom sauce. Stir to coat everything evenly.
- Transfer to baking dish: Pour the mixture into a greased 9x13-inch baking dish and spread it into an even layer.
- Bake the casserole: Bake uncovered for 25 minutes, until the sauce is bubbling at the edges and the beans look tender.
- Add the topping: Remove the dish from the oven and scatter the remaining crispy fried onions evenly over the top.
- Finish baking: Return the casserole to the oven and bake for another 5 minutes, until the onions turn deep golden and crisp.
- Rest before serving: Let the casserole sit for 5 minutes so the sauce sets slightly before serving warm.
More Recipes You'll Love
- Sweet Potato Casserole with Toasted Marshmallow Topping (https://hellarecipe.com/sweet-potato-casserole-with-toasted-marshmallow-topping/): another Thanksgiving classic with a sweet, crunchy top.
- Black Bean Casserole (https://hellarecipe.com/black-bean-casserole/): a hearty, budget-friendly casserole for weeknights.
- Sausage, White Bean & Kale Soup (https://hellarecipe.com/sausage-white-bean-kale-soup/): a warm, savory soup that pairs well with this casserole's richness.
- Greek Bean Soup (Fasolada) (https://hellarecipe.com/greek-bean-soup-fasolada/): a lighter bean-based dish to balance out a heavy holiday table.
