Green Mac and Cheese

Method

1. Heat the oven to 220C fan.
2. Put the milk, butter and flour into a large saucepan and bring to a simmer, whisking continuously until you have a smooth, thick sauce, about 3-4 mins.Add a pinch of salt and pepper, then add the mustard, spinach and cheese (if using.)
3. Meanwhile, cook the pasta in boiling salted water for 5 mins. Add the broccoli and continue cooking until the pasta is cooked through and the broccoli is soft. Drain.
4. Transfer half the cooked broccoli to the white sauce. Blend together until smooth, creamy and bright green using a hand blender. If it becomes too thick add a small splash of milk.
5. Stir in the pasta, the remaining broccoli and the peas and pour into a large baking dish. Pop on the additional toppings if you are using for extra crunch.
6. Bake for 20-25 mins, until the top is crunchy and the sauce is bubbling.