Cook the macaroni in salted water for 10 minutes until just tender. Drain and set aside.
Melt the butter in a pan. Add the flour and cook, stiring for 1 minute. Remove from heat and gradually blend in the milk. Bring to the boil until it begins to thicken. Simmer for 5 minutes, stirring.
Add the mustard, macaroni and ¾ of the cheese to the sauce and season with salt and pepper.
Lightly grease your ovenproof dish and spoon in the macaroni mixture. Sprinkle with breadcrumbs and the remaining cheese and bake in a pre-heated oven 180°c Fan / Gas 6 for about 20 minutes until golden brown.
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