Spanakopita or Greek spinach pie

Preparation

Preheat oven to 200 degrees.
Heat olive oil in a large skillet, add onion and garlic and fry for 3 minutes.
Then add spinach, and cook until wilted, for about 5 minutes.
Let it drain (for about 10 minutes) and mix stir in egg, herbs, feta in a bowl and bring to taste with pepper and salt.
Create two equal sized sheets of puff pastry or phyllo, for example a square or a round form. 
Lay a sheet of puff pastry on a parchment-lined baking sheet. Divide the spinach mixture equally over the puff pastry, leaving a little space to fold the sides.
Top with the other sheet of puff pastry and fold sides.
Bake until dark golden, for about 20 - 30 minutes.