Preheat the oven to 200ºC, fan 180ºC, gas 6. Bring a large pan of water to the boil, add the pasta and cook for 8 minutes. Drain. Tip the cooked pasta back into the pan and stir through the pasta sauce, tuna, sweetcorn, chopped tomatoes and half the parsley.
Tip the mixture into a 1.5-litre baking dish and sprinkle the cheese over the top. Cook for 30 minutes, until golden and bubbling. Garnish with the remaining parsley just before serving.
Cook's tip: for extra crunch, whizz a few pieces of white sliced bread in a food processor until you have fine breadcrumbs. Mix with the cheese before scattering over the top