01 -
Heat the oven to 200°C / 400°F. Cook the pasta in boiling water for two minutes less than the packet time. Add broccoli for the last two minutes, then drain well.
02 -
Melt the butter in a saucepan over medium heat. Stir in the flour and cook for one minute without browning.
03 -
Whisk in the milk a little at a time. Bring to a gentle simmer, stirring, and cook for 3–4 minutes until the sauce coats a spoon.
04 -
Remove from the heat. Stir in the mustard, salt, pepper and 120 g cheddar. Fold in the drained pasta and broccoli.
05 -
Transfer to a 23 × 33 cm baking dish and scatter with the remaining 60 g cheddar. Bake for 20–25 minutes until bubbling and golden.
06 -
Rest for five minutes before serving. Refrigerate leftovers within two hours and use within three days; reheat until hot throughout.