Cut the puff pastry sheet into 6 or 12 squares, depending on the size you desire, and place them on the baking tray. This recipe makes six big puffs or 12 small puffs.
Into a mixing bowl, add the spinach, cream cheese, mozzarella cheese, and one egg. Season with a pinch of salt and pepper and mix everything.
Divide the spinach mixture into each square and fold two opposite edges of each square, pressing them tightly.
Brush all the spinach puffs with egg yolk. Bake for 25 to 35 minutes or until golden.
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