Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Prepare the Filling
In a mixing bowl, combine the chopped spinach, ricotta cheese, grated Parmesan, garlic powder, salt, and pepper. Mix well until all ingredients are fully incorporated.
Roll Out the Pastry
On a lightly floured surface, roll out the puff pastry sheets to smooth them out. Cut each sheet into squares, about 4×4 inches.
Fill the Pastry
Place a generous spoonful of the spinach and ricotta filling in the center of each pastry square. Be careful not to overfill.
Fold and Seal
Fold the pastry over the filling to create a triangle or rectangle shape, depending on your preference. Press the edges to seal, and use a fork to crimp the edges for an extra secure seal.
Brush with Egg Wash
Place the filled rolls on the prepared baking sheet. Brush the tops with the beaten egg for a golden finish.
Bake
Bake in the preheated oven for 20-25 minutes, or until the pastry is golden brown and puffed.
Cool and Serve
Remove from the oven and let the rolls cool slightly before serving. Enjoy warm or at room temperature!