Step 1

Preheat the oven to 220C/200C Fan/Gas 7.

Step 2

Cook the broccoli in boiling water for about 3 minutes or until just cooked through, then drain well and place in a small ovenproof dish.

Step 3

Melt the butter over a medium heat, add the flour and cook, stirring constantly, for 1 minute. Gradually add the milk, whisking well, until you have a smooth sauce. Continue to cook over a medium–low heat, stirring often, until the sauce has thickened slightly. Remove from the heat, add the grated cheese and mustard, a pinch of salt and some black pepper. Stir until the cheese is melted and well combined.

Step 4

Pour the cheese sauce over the broccoli and bake for 20–25 minutes, until the sauce is bubbling with golden patches on top.