Preheat the oven according to the puff pastry package instructions.

In a bowl, mix together fresh spinach, cream cheese, feta cheese, minced garlic, finely chopped onion, salt, pepper, and nutmeg.

Roll out the puff pastry sheets and cut them into squares.

Place a spoonful of the spinach mixture in the center of each square.

Fold the pastry over to form a triangle and seal the edges.

Brush the tops with beaten eggs.

Bake in the preheated oven until golden brown, approximately 20 minutes.