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Find a mug that holds twice the volume of your dry pasta – the bigger, the better. Add the macaroni and your liquid of choice. Cover with cling film and pierce 3 times. Stand the mug in a microwave-proof bowl to catch any spillages, and cook in the microwave on High for 2 mins. The liquid will bubble up and over the sides, so tip any liquid from the bowl back into the mug (be careful as it will be very hot) and give it a good stir. Leave to stand for 1 min.
Repeat twice more or until the pasta is cooked (it may take longer depending on the pasta), then remove from the microwave. Stir through the butter, cheese and spinach or Marmite, if using. The heat from the pasta should melt the cheese and wilt the spinach, but if not, pop back in the microwave for 30 secs.