Get a deep oven-safe bowl that fits inside your air fryer basket.
Add macaroni, milk, chilli flakes, oregano, black pepper, salt, and 1 tablespoon of the grated mozzarella. Stir well to combine.
Place the bowl in the air fryer basket. Cook at 185°C (370°F) for 20 minutes.
At the 10-minute mark, carefully remove the bowl and stir the macaroni well. Return to the air fryer and continue cooking.
After 20 minutes, check that the pasta is soft and the milk looks thick and creamy.
Spread the remaining mozzarella over the top. Air fry at 185°C (370°F) for 2 to 3 minutes, until the cheese melts and turns lightly golden.
Remove from the air fryer and rest for 2 to 3 minutes before serving.