Everyone’s Favorite Casserole
My mother’s classic Sunday dinner was meatloaf, baked potatoes, and green bean casserole. She loved how the humble green bean transformed into something rich and comforting with a creamy mushroom sauce. We didn’t always make a fully homemade version, so when I perfected this recipe it felt special. This is my favorite take on green bean casserole: fresh green beans blanched to retain a tender-crisp texture, a deeply flavored mushroom sauce, and the final crowning touch of crispy fried shallots. It’s straightforward to prepare but special enough to save for holiday meals and important gatherings.
Green Bean Casserole Ingredients
- Green beans: Fresh green beans are preferred for the best texture. Use haricot vert or regular garden beans—both work well.
- Mushrooms: Take the time to brown mushrooms fully before seasoning; salt too early draws moisture and prevents good browning.
- Dijon mustard: A small amount adds rounded, savory complexity without an overt mustard taste.
- Worcestershire sauce: A little adds a subtle, savory depth to the sauce.
- Lemon juice: A few teaspoons brighten the rich mushroom sauce and lift the flavors.
- Shallots: Thinly sliced and fried until crisp, shallots provide the signature crunchy topping.
See the recipe card below for exact ingredient quantities.
How to Make Green Bean Casserole
Step 1 — Blanch the green beans: Trim and cut the beans to your preferred length (about 3 inches is a comfortable size). Bring a large pot of salted water to a boil, add the beans, and cook for about 5 minutes until crisp-tender. Immediately transfer the beans to an ice water bath to stop the cooking and preserve bright color and firm texture. Keep them chilled while you prepare the sauce.
Step 2 — Make the mushroom sauce: Quarter the mushrooms. In a large skillet, melt a portion of the butter over medium heat and add the mushrooms. Cook without salt until they release moisture and brown, developing fond on the pan. Add the remaining butter and the salt, then stir in the flour to form a roux, cooking for about a minute. Add minced garlic, Dijon mustard, and Worcestershire sauce. Whisk together the milk and stock, then slowly add this liquid to the mushrooms while stirring. Simmer until the sauce thickens, then remove from the heat and stir in sour cream, fresh lemon juice, and black pepper to finish.
Step 3 — Combine and bake: Drain the blanched beans and return them to the pot or a mixing bowl. Pour the mushroom sauce over the beans and mix until evenly coated. Transfer the mixture to a greased 9 x 13-inch baking dish and smooth the top. Bake in a preheated 350°F oven for about 18–25 minutes, until the sauce is bubbling.
Step 4 — Make the crispy shallot topping: Thinly slice shallots into rounds. Heat a high-smoke-point oil (such as sunflower, avocado, peanut, or canola) to around 300°F in a deep saucepan. Fry the shallot rounds in batches until golden brown and crisp, 12–15 minutes per batch. Drain on paper towels and season lightly with kosher salt. Add the fried shallots to the casserole right before serving so they stay crisp.
Recipe Tips
- Cut the beans to your preferred length. I like about 3 inches, and I often leave the tips on for flavor.
- Cook the garlic briefly—30 seconds to one minute—so it mellows without burning.
- Choose a stable high-heat oil for frying the shallots (avocado, sunflower, peanut, or canola).
- Add the fried shallots after baking to preserve their crunch.
Frequently Asked Questions
Yes. Frozen green beans can substitute for fresh. They will need less blanching—about 3–4 minutes—since they are already partially processed.
Canned beans can be used, but they tend to be soft and may make the casserole mushy. Fresh or frozen is recommended for best texture.
White button or cremini mushrooms work well for texture and a balanced flavor. Wild mushrooms will change the flavor profile and are a personal preference.
This dish doesn’t freeze particularly well—the beans and sauce change texture. Refrigerated leftovers keep for about 7–10 days, though the fried shallots will soften in the fridge.
More Side Dish Recipes
- Twice-baked potato casserole
- Easy sweet potato casserole
- Apple and sausage cornbread stuffing
- Stuffed acorn squash casserole
- Easy pasta salad
- Family favorite potato salad
- Grandma’s truly homemade baked beans
- Easy macaroni salad
- Homemade scalloped potatoes
- Classic deviled eggs
Have I Convinced You to Make This Recipe?
Give this homemade green bean casserole a try and put something delicious on your table. If you cook it, leave a comment and a rating to let others know how it turned out for you—your feedback helps others feel confident making it too.
Homemade Green Bean Casserole
Ingredients
- 2 lbs green beans, cleaned, trimmed, and cut in half (or thirds)
- 4 tbsp unsalted butter, divided
- 1 lb mushrooms, cleaned and quartered
- ¾ tsp kosher salt
- 3 tbsp all-purpose flour
- 2 cloves garlic, minced
- 2 tsp Dijon mustard
- 1 tbsp Worcestershire sauce
- 1 cup whole milk
- ¾ cup chicken stock
- ⅓ cup sour cream
- ½ tsp freshly ground black pepper
- 2 tsp fresh lemon juice
- 1 lb shallots, sliced thin
Instructions
- Preheat the oven to 350°F. Grease a 9 x 13-inch baking dish. Prepare a large bowl of ice water. Whisk together the milk and chicken stock and set aside.
- Bring 2 quarts of water to a boil in a stockpot. Add 1 tbsp salt and the green beans. Cook for 5 minutes until crisp-tender, then drain and plunge into the ice water. Set aside.
- In a large skillet, melt 2 tbsp butter over medium heat. Add mushrooms and cook 10–12 minutes until evenly browned. Add the remaining butter and the salt. Sprinkle in the flour and cook for 1 minute, stirring.
- Add the garlic, Dijon, and Worcestershire, then slowly whisk in the milk-stock mixture. Simmer until the sauce thickens. Remove from heat and stir in sour cream, black pepper, and lemon juice.
- Drain and dry the green beans, then toss them with the mushroom sauce. Transfer to the prepared baking dish and smooth the top. Bake 18–25 minutes until bubbling.
- While the casserole bakes, heat about 1 quart of high-heat oil to 300°F. Fry the shallots in batches until golden and crisp, 12–15 minutes per batch. Drain on paper towels and season with kosher salt.
- Top the baked casserole with the crispy shallots and serve immediately.
Notes
The length of green beans is a matter of preference; about 3 inches works well. Sauté the garlic briefly to remove its raw edge but avoid burning. Use a high-heat oil for frying shallots, and add the fried shallots to the casserole after baking to keep them crisp.
Nutrition
Serving: 1 serving • Calories: 240 kcal (approximate)
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