Green Bean Casserole with Creamy Mushroom Sauce and Fried Onions
Why this recipe works
- Deeper mushroom flavour: Cooking the mushrooms until their moisture evaporates concentrates their savoury flavour before the cream and milk are added.
- Creamy centre, crisp topping: Tender green beans sit in a rich mushroom sauce, while fried onions added at the end keep the top crisp and golden.
- Straightforward method: The recipe uses simple steps: blanch the beans, simmer the sauce, combine, bake and finish with the topping.
Get the most out of this recipe
Timing notes
- Let it stand before serving: A short rest after baking helps the sauce settle slightly, so the casserole serves more neatly.
- Best served hot: Serve soon after the fried onions are crisped, as the topping will soften if left sitting for too long.
Make-ahead tips
- Prepare the base in advance: The beans and mushroom sauce can be assembled ahead and chilled before baking. Add the fried onions only for the final bake.
- Reheat for best texture: Reheat in a 180°C (355°F) oven until piping hot, then refresh the top with extra fried onion if needed.
Ingredient notes
- Green beans: Blanching the beans first keeps them bright and just tender before they finish cooking in the oven.
- Mushrooms: Button mushrooms give a mild, classic flavour; oyster mushrooms can be used for a more pronounced savoury note.
- Fried onions: Adding the onions near the end protects their crunch and prevents them from becoming heavy or soggy.
Authenticity notes
- American home-style side: Green bean casserole is a recognisable American side dish, often served from the baking dish as part of a larger meal.
- Fresh mushroom sauce: This version keeps the familiar creamy profile and fried onion topping while using a freshly cooked mushroom sauce.
Equipment you'll need
Ingredients
Instructions
- Heat the oven to 190°C (375°F). Bring a large pot of well-salted water to the boil.
- Trim the green beans, then boil for 4 to 5 minutes until bright green and just tender. Drain well in a colander and set aside.
- Slice the button mushrooms and finely chop the garlic. Melt the unsalted butter in a large frying pan over medium-high heat.
- Add the mushrooms and cook for 6 to 8 minutes, stirring, until their liquid has evaporated and they are lightly golden. Stir in the garlic and cook for 30 seconds until fragrant.
- Pour in the whole milk and double cream, then season with the fine sea salt and black pepper. Bring to a gentle simmer and cook for 4 to 6 minutes, stirring, until the sauce lightly coats the back of a spoon.
- Add the drained green beans to the pan and toss to coat in the creamy mushroom sauce. Tip into a baking dish and spread into an even layer.
- Bake for 18 to 22 minutes until bubbling around the edges. Scatter the fried onion over the top and bake for 5 minutes more until the topping is crisp and golden.
- Rest for 5 minutes so the sauce settles slightly, then serve hot. Add a little extra black pepper at the table if you like.
Recipe notes
Tips
- Drain the green beans very well so the sauce stays creamy rather than watery.
- Cook the mushrooms until their moisture has evaporated and they start to colour; this gives the casserole a deeper savoury flavour.
- If serving vulnerable groups, make sure the casserole is baked until piping hot all the way through.
Substitutions
- Replace double cream with whole milk for a lighter sauce, but simmer a little longer so it thickens.
- Replace button mushrooms with oyster mushrooms for a more pronounced mushroom flavour.
Storage
- Refrigerate up to 3 days
- Cool completely, then refrigerate in a sealed container. Reheat in a 180°C (355°F) oven for 15 to 20 minutes until piping hot; add a fresh sprinkle of fried onion for best crunch.
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Recipe overview
- Servings: 4 servings
- Total time: 50min (20min active)
- Difficulty: Easy
- Cuisine: American
-
Allergens:
Milk
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