Preheat your oven to 180 degrees Celsius, 360 Farenheit
Cook the pasta as per the packet instructions
Whilst the pasta is cooking, heat a frying pan to a medium heat and sauté the diced onion in the first measure of olive oil.
Once the onion is softened and fragrant add the tuna (do not drain), the first measure of grated cheese and the cream. Season with salt and pepper. Simmer for 2 minutes. Don't worry if the sauce is still relatively thin, it will thicken when it cooks in the pasta bake.
Drain the cooked pasta and return it to the cooking pot.
Stir the tuna cream sauce, the frozen peas and corn through the drained pasta. Transfer the pasta into a baking dish.
In a bowl combine the panko bread crumbs, grated cheese, second measure of cheese, parsley, lemon zest, and salt and pepper. Sprinkle this bread crumb topping over top of the pasta.
Bake at 180 degrees celsius for 20-25 minutes, until heated through and the bread crumb topping is golden and crunchy.
Enjoy