Combine the mascarpone and chives and set aside. Place the egg yolks, cream, salt and pepper in a bowl and whisk to combine. Whisk the eggwhite until stiff peaks form and fold through the egg yolk mixture. Melt the butter in a 20cm non-stick frying pan over medium heat. Pour the egg mixture into the pan and cook for 5 minutes. Sprinkle with the parmesan and cheddar. Spoon the mascarpone mixture onto one side of the omelette and carefully fold over to enclose the filling. Cook for a further 1–2 minutes. Sprinkle with extra parmesan to serve. Serves 2.