In a nonstick skillet, heat 2 tbs of butter and saute the onions. Remove from heat and add some salt and pepper. When onions get cool, pour them into a bowl.
Add the chicken, the cheeses and the herbs. Beat the eggs with the milk cream and some pepper and pour them into the chicken mixture. Stir well.
Lay one pastry sheet into an elongated baking dish by covering bottom and sides. Spread the filling and cover with the second sheet. Bake the pie 1 hour in preheated oven at 180 ° C.
*To make homemade fluffy dough you will need: 300g all-purpose flour, 150 g butter, 150g Greek yogurt, 1 teaspoon baking powder, 1 egg. Knead the butter with the flour and the baking powder. Add the yogurt, the egg and salt and continue kneading. Leave the dough in the refrigerator for 30 minutes and then use it.