Beat the eggs and oil, set aside about 1/2 cup of this mixture, top it off with carbonated water.
Set the cup aside for the topping.
To the rest of the mixture, add the yoghurt, 1/2 cup carbonated water, the flour, baking soda and baking powder.
Sprinkle 3-4 tbsp of the filling and feta cheese onto each sheet. Roll them up.
Arrange them in a cold over and pour on the set aside topping, then bake at 338°F (170 °C) with the fan on for about 30 min. Once it's ready, it'll be tasty and fluffy.