Preheat your oven to 180℃/200℃/400F, Gas Mark 6.
Boil the macaroni in a pan of salted boiling water for 2 minutes less than it says on the pack. Drain then stir through the butter to stop it sticking together.
Make the cheese sauce by melting the butter in the large saucepan over a medium heat and then stirring in the flour to make a paste. Cook this for a minute, stirring the whole time.
Gradually add in the milk, whisking continuously to make sure you don’t get any lumps. Keep the sauce over the heat until it has thickened slightly and coats the back of a spoon.
Stir in the mustard and cheese and add a good pinch of salt and pepper.
Stir the pasta into the sauce.
Spoon half of the macaroni into a baking dish then top with half of the grated mozzarella, cheddar and red Leister.
Add the remaining half of the macaroni on top and finish with the rest of the grated cheese.
Bake in the oven for 15-20 minutes until the cheese on top is golden.
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