Step 1

Preheat oven to 180°C. Cook the macaroni in a large saucepan of boiling water following packet directions or until al dente. Drain well.

Step 2

Meanwhile, melt the butter in a large saucepan over medium heat. Add flour and mustard. Cook, stirring, for 2 mins or until the mixture bubbles and is grainy. Reduce heat to low. Gradually add the milk, stirring constantly. Cook, stirring, for 5 mins or until the sauce boils and thickens. Remove from heat. Add cheddar. Stir to combine. Season.

Step 3

Stir the macaroni into the sauce. Spoon into a 10-cup (2.5L) ovenproof dish. Combine the breadcrumbs and parmesan in a small bowl. Sprinkle evenly over the macaroni mixture in the dish. Spray with olive oil spray. Bake for 15 mins or until golden.