01 - Preheat oven to 400°F. Line baking tray with parchment paper.
02 - Combine spinach, feta cheese, cream cheese, garlic, half beaten egg, dill, black pepper, and salt in bowl. Mix thoroughly until evenly blended.
03 - Unroll puff pastry sheet on lightly floured surface. Spread spinach and feta filling evenly over pastry, leaving ½-inch border along one long edge.
04 - Starting from opposite long edge, tightly roll pastry into log. Seal edge with small amount of water.
05 - Using sharp knife, slice log into ¾-inch thick pinwheels (approximately 20 pieces). Place flat, cut side up, on prepared baking tray.
06 - Brush tops of pinwheels with remaining beaten egg.
07 - Bake for 18-20 minutes until puffed and golden brown.
08 - Let cool slightly before serving warm or at room temperature.