Sift the flour, baking powder, salt and cayenne. Separately combine the milk and egg yolks. Combine the 2 together and mix well.
Add the parmesan cheese, cheddar cheese, diced mozzarella, tomatoes and parsley and mix well.
Whisk the egg whites to stiff peak and fold into the mixture.
Pre heat the griddle side your grill. Spoon some of the mixture onto the griddle in even amounts and allow to cook for 1-3 minutes until the mixture starts to bubble. Flip over and cook for a further 1-3 minutes. Repeat until all mixture is cooked.