Turn macaroni cheese into a lunchbox staple by baking it in individual silicone cupcake moulds.
Preheat the oven to 200C/390F/Gas 6.
Melt the butter in a saucepan over a medium heat. Once the butter is melted, add the flour and cook for about three minutes, or stirring continuously. Gradually add the milk, a little at a time, to the flour and butter mixture, stirring with a wooden spoon until any lumps have melted and the sauce is glossy before adding more milk. Once all the milk has been incorporated, reduce the heat to low and simmer for about three minutes. Stir in the cheddar and half the parmesan until it's melted.
Add the cooked pasta to the cheese sauce and transfer the mixture to a deep baking dish. Alternatively, line the holes of a muffin tin with six silicone cupcake wrappers and divide the mixture evenly between them. Sprinkle with the remaining parmesan and place in the oven to cook for about 20 minutes, or until golden-brown. Serve hot or cold.