Steps:

• Preheat the oven to 375 degrees F.
• Heat the butter in a saute pan and cook the onions over medium-low heat for 5 to 7 minutes, until tender. Add the garlic and cook for 1 more minute. Meanwhile, squeeze most of the water out of the spinach and place it in a bowl. Add the onion mixture, scallions, Gruyere, Parmesan, eggs, bread crumbs, salt, pepper, nutmeg, and pignolis. Mix well.
• Unfold one sheet of puff pastry and place it on a baking sheet lined with parchment paper. Spread the spinach mixture in the middle of the pastry, leaving a 1-inch border. Brush the border with the egg wash. Roll out the second piece of puff pastry on a floured board until it's an inch larger in each direction. Place the second sheet of pastry over the spinach and seal the edges, crimping them with a fork. Brush the top with egg wash but don't let it drip down the sides or the pastry won't rise. Make three small slits in the pastry, sprinkle with salt and pepper, and bake for 30 to 40 minutes, until the pastry is lightly browned. Transfer to a cutting board and serve hot.

Steps:

• Preheat oven to 375. Line a baking sheet with parchment (preferable) but you can use aluminum foil with a light spray of cooking oil.
• Melt butter and cook onions for a few minutes, until soft. Add garlic and cook for another minute.
• Beat eggs in medium bowl. Add cooked onion, spinach, feta, parmesan, bread crumbs. Add salt, pepper, & nutmeg. Mix well with fork.
• Place one unfolded sheet of puff pastry on the parchment or sprayed aluminum foil. Spread the spinach mixture over the pastry, leaving a border of one inch all around the edges. Keep the spinach flat; do not pile high.
• Brush the edges with the egg wash made with the last egg. Cover with the second sheet of pastry that has been slightly flattened with a rolling pin to one inch bigger than the first sheet. (This ensures all the spinach will be covered). Press edges together with fingertips or fork, making sure mixture is sealed well. Brush just the top with egg wash, careful not to drip any down the sides. Cut a few slits in the top with a sharp knife to allow steam to escape.
• Bake 30-40 minutes, until golden brown. Can be served hot or at room temperature.