Method:
Follow the basic dough recipe and while its resting make the filling and allow it to cool completely before using.
To make the filling, in a sauce pan heat the oil, add the butter, chopped onions and garlic, stir till they become soft and golden.
Add the spinach, salt and pepper, stir till all the leaves starts to change in color and their water comes out, lower the heat and leave it uncovered to allow all liquids to evaporate, turn off the heat and leave it to cool in room temperature.
After the spinach mixture is completely cooled add the feta and cream cheese, mix well and set a side.
Pre-heat the oven to 160C, rack in the middle and prepare a baking tray with parchment paper.
Roll out the dough into a rectangular about 1/2 cm thick, spread the filling all over it then start rolling from the longer side, cut the roll into slices about 1.5 cm thick and place them on the tray leaving some space between each.
Mix egg yok and milk and brush each roll a bit to give it a cool while baking, bake for 30 mins or until golden brown, allow to cool on a wire rack before serving.