Green bean casserole belongs on a Thanksgiving table, but the classic version made with canned soup can taste flat and salty. This one starts from scratch. Fresh green beans are blanched until bright green and still crisp, then folded into a homemade mushroom cream sauce with garlic, thyme and a little Parmesan. The topping is not canned onions either: thin shallots are fried gently until golden and crisp, with half stirred into the beans and half scattered on top. The result tastes like the casserole everyone remembers, only fresher, richer and brighter. It bakes in one dish, it feeds a crowd, and it reheats well.
Ingredients
- 600 g fresh green beans, trimmed — use fresh beans, not frozen, so they stay bright and crisp
- 3 large shallots, peeled and sliced into thin rings
- 120 ml vegetable oil, for frying the shallots
- 3 tablespoons plain flour, for dusting the shallots
- 30 g unsalted butter
- 250 g mushrooms, sliced — button or chestnut mushrooms both work
- 3 garlic cloves, minced
- 1 teaspoon fresh thyme leaves, or 1/2 teaspoon dried thyme
- 2 tablespoons plain flour, for the sauce
- 250 ml whole milk
- 120 ml double cream
- 40 g Parmesan cheese, finely grated
- 1 teaspoon soy sauce — a small amount adds a savoury depth to the mushroom sauce
- Salt and black pepper, to taste
Method
- Bring a large pot of salted water to a boil. Fill a large bowl with cold water and ice. Drop the green beans into the boiling water and blanch for exactly 3 minutes, then lift them out and plunge them straight into the ice water. Drain well and set aside. The ice water stops the cooking, so the beans stay bright green and crisp instead of going grey and limp.
- Fry the shallots: heat the oil in a wide pan over medium heat. Toss the shallot rings in the 3 tablespoons of flour and shake off the extra. Fry them in batches for 2 to 3 minutes, until they turn light golden. Pull them out while they are still light golden, as they keep darkening off the heat. Drain them on kitchen paper and sprinkle with a little salt. Keep the heat at medium — if the oil is too hot, the shallots turn bitter.
- Heat the oven to 190°C (375°F). Butter a medium baking dish, about 20 x 30 cm.
- Melt the butter in a large pan over medium heat. Add the mushrooms and cook for 6 to 8 minutes, until they release their water and turn golden brown at the edges. Stir in the garlic and thyme and cook for 30 seconds more.
- Sprinkle the 2 tablespoons of flour over the mushrooms and stir for 1 minute. Pour in the milk a little at a time, stirring constantly, until the sauce thickens. Stir in the cream, Parmesan, and soy sauce. Simmer gently for 2 minutes, then taste and add salt and pepper.
- Fold the blanched green beans into the mushroom sauce, along with half of the fried shallots. Tip everything into the buttered baking dish and spread it evenly.
- Bake for 20 to 25 minutes, until the sauce is bubbling at the edges. Scatter the rest of the fried shallots over the top and bake for 3 to 5 minutes more, until they are crisp. Serve hot.
Common Mistakes, Substitutions, Serving and Storage
Common mistakes: blanching the beans too long, so they go grey and limp; frying the shallots in oil that is too hot, so they turn bitter; adding the milk all at once, so the sauce goes lumpy; baking the shallot topping too long, so it burns.
Substitutions: use frozen green beans if you cannot find fresh ones, blanching them for only 1 minute; use a mix of mushrooms, such as shiitake and chestnut, for a deeper flavour; use a dairy-free cream and milk if you need it, but the sauce will be thinner.
Serving ideas: serve hot as a Thanksgiving side dish next to roast turkey, or with roast chicken or ham. It sits well on a holiday table next to mashed potatoes and cranberry sauce.
Storage and reheating: refrigerate leftovers for up to 3 days. Reheat in the oven at 175°C (350°F) for 15 minutes, and add a few fresh fried shallots on top if you have them, as the topping softens in the fridge. Do not freeze the baked casserole.
Frequently Asked Questions
Why blanch the beans for only 3 minutes?
Three minutes is enough to soften them slightly while keeping them bright green and crisp. Any longer and they go grey and limp in the oven, and the casserole loses its fresh taste.
Why fry the shallots at medium heat?
Shallots burn fast in very hot oil and turn bitter. Medium heat lets them turn light golden and crisp, and they keep darkening for a minute after you take them out, so pull them early.
Why no canned soup?
A homemade mushroom cream sauce tastes richer and fresher, and you control the salt. Canned soup is often very salty and flat, and it hides the flavour of the green beans.
Can I make it ahead?
Yes. Make the sauce and blanch the beans up to 1 day ahead and keep them separately in the fridge. Fry the shallots on the day, assemble the casserole, and bake as directed, adding 5 minutes to the bake time.
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Green Bean Casserole with Crispy Fried Shallots and Mushroom Cream Sauce
Ingredients
Method
- Bring a large pot of salted water to a boil. Fill a large bowl with cold water and ice. Drop the green beans into the boiling water and blanch for exactly 3 minutes, then lift them out and plunge them straight into the ice water. Drain well and set aside. The ice water stops the cooking, so the beans stay bright green and crisp instead of going grey and limp.
- Fry the shallots: heat the oil in a wide pan over medium heat. Toss the shallot rings in the 3 tablespoons of flour and shake off the extra. Fry them in batches for 2 to 3 minutes, until they turn light golden. Pull them out while they are still light golden, as they keep darkening off the heat. Drain them on kitchen paper and sprinkle with a little salt. Keep the heat at medium — if the oil is too hot, the shallots turn bitter.
- Heat the oven to 190°C (375°F). Butter a medium baking dish, about 20 x 30 cm.
- Melt the butter in a large pan over medium heat. Add the mushrooms and cook for 6 to 8 minutes, until they release their water and turn golden brown at the edges. Stir in the garlic and thyme and cook for 30 seconds more.
- Sprinkle the 2 tablespoons of flour over the mushrooms and stir for 1 minute. Pour in the milk a little at a time, stirring constantly, until the sauce thickens. Stir in the cream, Parmesan, and soy sauce. Simmer gently for 2 minutes, then taste and add salt and pepper.
- Fold the blanched green beans into the mushroom sauce, along with half of the fried shallots. Tip everything into the buttered baking dish and spread it evenly.
- Bake for 20 to 25 minutes, until the sauce is bubbling at the edges. Scatter the rest of the fried shallots over the top and bake for 3 to 5 minutes more, until they are crisp. Serve hot.
