Prepare the Filling:

In a mixing bowl, combine the chopped spinach, crumbled feta cheese, grated Parmesan cheese, and minced garlic.
Season with salt and black pepper to taste (be careful with salt as feta is salty).
Mix until well combined.
Prepare the Puff Pastry:

Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Roll out the puff pastry sheet on a lightly floured surface to smooth out any creases.
Spread the spinach and feta mixture evenly over the puff pastry, leaving a small border around the edges.
Roll and Slice:

Starting from one edge, carefully roll the puff pastry into a tight log.
Use a sharp knife to slice the log into 1/2-inch thick rounds.
Place the pinwheels on the prepared baking sheet, spacing them about an inch apart.
Bake:

Brush the tops of the pinwheels with the beaten egg to give them a golden shine.
Bake for 15-20 minutes, or until the pinwheels are puffed and golden brown.
Let the pinwheels cool for a few minutes before transferring them to a serving platter.
Recipe Tips:

Fresh or Frozen Spinach: If using frozen spinach, make sure to thaw and squeeze out any excess water to prevent sogginess.
Customize the Filling: Add a pinch of dried oregano or fresh dill for an extra layer of flavor.
Puff Pastry Handling: Keep the puff pastry cold for easy handling and best results when baking.
Decoration Tips:

Garnish with Fresh Herbs: Sprinkle chopped fresh parsley or dill over the baked pinwheels for a pop of color.
Serve on a Wooden Board: Arrange on a wooden or marble board for an elegant presentation.
Dip Option: Serve with a side of Greek yogurt mixed with a touch of garlic and herbs for dipping.
These Spinach and Feta Pinwheels are a tasty, flaky appetizer that’s both easy to make and impressive to serve. Perfect for holiday gatherings or any time you crave a savory snack!