01 -
Preheat the oven to 400°F (200°C). Line a baking sheet with parchment paper.
02 -
In a medium mixing bowl, blend the thawed, drained spinach with cream cheese, Parmesan, mayonnaise, garlic powder, onion powder, black pepper, and optional red pepper flakes until well incorporated.
03 -
Lightly flour a work surface and unfold the puff pastry sheet carefully. Spread the spinach mixture evenly over the entire surface of the pastry.
04 -
Starting at one edge, roll the pastry tightly into a log shape. Using a sharp knife, cut the log into 1-inch thick slices to create individual pinwheels.
05 -
Arrange the pinwheels flat on the prepared baking sheet, spacing them evenly. Brush the tops lightly with beaten egg to promote browning.
06 -
Bake in the preheated oven for 18 to 20 minutes until golden brown and puffed. Remove from oven and allow to cool slightly before serving.