Description
This classic Green Bean Casserole features tender green beans and sautéed mushrooms enveloped in a creamy homemade white sauce, topped with crispy onions for a delightful crunch. Perfectly baked to a golden brown, this comforting side dish is a staple for family meals and holiday dinners.
Ingredients
Scale
Vegetables
- 500g green beans, trimmed
- 250g chestnut or button mushrooms, sliced
White Sauce
- 50g butter, divided
- 2 tbsp olive oil
- 50g flour
- 500ml milk
Topping
- 100g crispy onions
Instructions
- Sauté Mushrooms: Heat 1 tbsp of butter and the olive oil in a large pan over medium heat. Add the sliced mushrooms and fry for 10-15 minutes until they turn golden brown, stirring occasionally to prevent sticking.
- Cook Green Beans: Stir in the trimmed green beans with the mushrooms and cook for an additional 3-4 minutes until the beans turn a bright green color and are tender-crisp. Then scoop out the vegetable mixture onto a plate and set aside.
- Make White Sauce: Preheat the oven to 200°C (180°C fan)/gas mark 6. In the same pan, melt the remaining butter until foaming. Remove the pan from heat briefly and sprinkle the flour over the melted butter, stirring swiftly to create a golden brown paste (roux). Return the pan to the heat and gradually add the milk a splash at a time, stirring continuously to avoid lumps and achieve a smooth, thick white sauce. Season the sauce well with salt and pepper to taste.
- Combine and Bake: Stir the cooked green beans and mushrooms into the white sauce until fully incorporated. Transfer the mixture into a medium ovenproof dish and spread it evenly. Scatter crispy onions evenly over the top.
- Bake: Place the dish in the preheated oven and bake for 20-30 minutes until the sauce is bubbling and the crispy onions are golden brown. If the onions start browning too quickly, cover the dish loosely with foil to prevent burning. Remove from oven and let it cool slightly before serving.
Notes
- For a richer flavor, add cheese to the white sauce before combining with the vegetables.
- For a quicker version, you can substitute the homemade white sauce with a can of cream of mushroom soup.
- Ensure green beans are fresh and trimmed well for best texture.
- Cover the casserole if topping browns too fast during baking to avoid burning the onions.
- Prep Time: 15 minutes
- Cook Time: 40 minutes
- Category: Side Dish
- Method: Baking
- Cuisine: American
Keywords: Green bean casserole, green beans, mushroom casserole, baked side dish, holiday side dish, crispy onions, comfort food
