First, you have to make the bread dough. You can do it either by hand or using a mixer with a dough hook.
To make the dough you need to mix the main ingredients: flour, salt, yeast and sugar together. You can add to the mixture water and oil. Start with less water and keep kneading for about 10-15mins until you get a springy, soft dough.
Use a large bowl and put a few drops of oil and spread it through the bottom. Add the dough into it and cover it. Set it aside till it doubles its size.
Till you are waiting you can heat a large sauté pan with 2 tbsp oil and cook the onion till you see it that it starts getting caramelized.
Preheat the oven to 200C and split the dough into 4 pieces and create an oval-like shape.
Now put in each of the dough pieces the caramelized onions, tomatoes, oregano and feta cheese.
The ends of each oval-like dough pieces need to twist in order to hold the mixture inside.
Put them into a baking dish, put on top salt and pepper, sprinkle some extra olive oil and bake for 15-18 mins. When you see that the dough is getting golden brown then you can turn off the oven.
It is recommended to serve them warm.