Potato Mixture
In a bowl, add the sardines chopped into small pieces, add the pepper and the chopped tomato, mix, add the corn, the onion, the curd cheese, some parsley and chives and mix again, add the creamy cheese spread, the oregano and the salt, mix well and set aside.
In a blender, add the boiled and mashed potatoes, the Parmesan, the eggs, the oil, the salt, the milk, the wheat flour and the corn starch, blend very well until combined, add the baking powder and mix.
Grease a baking dish with butter and flour, add half of the potato mixture, add the sardine filling then cover it with the rest of the mixture. Top with some grated parmesan and oregano.
Bake in a preheated oven at 200°C (392°F) for 60 to 90 minutes (do the toothpick test).