This casserole combines tender cauliflower and broccoli florets with a creamy cheese sauce, baked to perfection with a golden breadcrumb topping. It’s a versatile and delicious way to enjoy classic vegetables with a luxurious twist.
Preheat your oven to 200°C (180°C fan) or 400°F.
Bring a large pot of salted water to a boil. Blanch the cauliflower and broccoli florets for 3-4 minutes until slightly tender but still firm. Drain and set aside.
In a saucepan, melt the butter over medium heat. Stir in the flour and cook for 1-2 minutes to form a roux. Gradually add the milk, whisking constantly, until the sauce thickens. Remove from heat and stir in the grated cheddar cheese, Dijon mustard (if using), and season with salt and pepper.
In a casserole dish, arrange the blanched cauliflower and broccoli evenly. Pour the cheese sauce over the vegetables, ensuring they are well coated.
In a mixing bowl, combine the breadcrumbs, Parmesan cheese, olive oil, and chopped herbs (if using). Sprinkle the topping evenly over the casserole.
Place the dish in the preheated oven and bake for 20-25 minutes, or until the topping is golden and crispy.
Remove the casserole from the oven and let it cool for a few minutes before serving. Garnish with additional herbs if desired.