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Preheat oven to 400 degrees Fahrenheit.
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Defrost the puff pastry dough. There are 3 puff pastry rectangles per sheet. You'll need 4 rectangles for the bottom and 4 rectangles for the top.
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Press 4 rectangles of the puff pastry dough to fit a 9 x 13 inch baking dish. You will need to pinch the seems together. A little water acts like glue. If the dough gets too soft, use a little flour. Then use a fork or knife to pierce some air vents in the dough. Brush half of the melted butter on the dough.
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Bake for about 10 minutes. Set aside. The bottom needs that extra time to bake.
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Take the dish out of the oven. Lower the heat to 375 degrees Fahrenheit.
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Pour the spinach feta mixture over the cooked puff pastry.
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Prepare the top layer of dough. On a wooden board marble slab, pinch together 4 rectangles of the dough. Again, use water and flour as needed to act as your glue. Use a fork to pierce some air vents in the second sheet of dough.
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Cover the spinach feta mixture with the puff pastry dough. Brush with the remaining melted butter.
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In small bowl, beat an egg with a teaspoon of water. Brush about half of the egg wash on the top of the pie.
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Bake in the preheated oven for about 35 minutes, or until golden.