01 -
Preheat the oven to 375°F (190°C). Line a baking sheet with parchment paper.
02 -
Squeeze all excess moisture from the thawed spinach using a clean kitchen towel. In a mixing bowl, combine the drained spinach, softened cream cheese, shredded mozzarella, garlic powder, and onion powder until thoroughly incorporated.
03 -
Roll out the thawed puff pastry on a lightly floured surface and cut into even squares (approximately 3-4 inches each). Place a tablespoon of the spinach mixture in the center of each square. Fold the pastry diagonally to form triangles and firmly seal the edges using the tines of a fork.
04 -
Beat the egg in a small bowl and brush the mixture over the top of each puff to ensure a golden, shiny finish during baking.
05 -
Arrange the prepared puffs on the parchment-lined baking sheet, leaving space between each. Bake for 20-25 minutes, or until they have puffed up and turned golden brown.