01 -
In a medium mixing bowl, combine the well-drained spinach, softened cream cheese, grated Parmesan, mayonnaise, garlic powder, onion powder, black pepper, and red pepper flakes if using. Mix until smooth and fully incorporated.
02 -
Unroll the cold puff pastry sheet on a lightly floured surface, keeping the pastry chilled. Evenly spread the spinach mixture over the surface, leaving a 1/2 inch border along one edge.
03 -
Carefully roll the pastry sheet tightly into a log, starting from the opposite side of the bare edge. Seal the seam by pressing gently.
04 -
Using a sharp knife, cut the rolled pastry into 1/2-inch thick slices. Arrange pinwheels flat on a parchment-lined baking sheet, spacing them slightly apart.
05 -
Brush the tops of the pinwheels with the beaten egg. Bake in a preheated 400°F (205°C) oven for 23–25 minutes, until golden brown and crisp.
06 -
Allow pinwheels to cool on the baking sheet for 5 minutes before transferring to a serving platter. Serve warm.