Preheat oven to 180°C
Mix the contents of the KNORR Macaroni Cheese & Bacon Sauce sachet, the pasta, milk, water and Stork margarine together and bring to the boil.
Simmer for 8-10 min stirring occasionally until cooked.
Heat the oil in a pan and fry the leeks, mushrooms and prawns.
Mix the pasta with the leeks, mushrooms and prawns.
Place in an ovenproof dish.
Sprinkle the parmesan cheese over the top.
Bake at 180°C for 25 min or until golden brown.