Preheat your oven to 200°C (400°F). Line a baking sheet with parchment paper.
Prepare the Filling: In a skillet, sauté the chopped spinach until wilted. Transfer to a bowl and let it cool slightly.
To the bowl with spinach, add ricotta cheese, parmesan cheese, minced garlic, nutmeg, salt, and pepper. Mix well until combined.
Assemble the Rolls: Roll out the puff pastry on a lightly floured surface into a rectangle about 30×20 cm (12×8 inches). Cut into 8 squares.
Place a spoonful of the spinach and cheese mixture in the center of each square. Fold the corners of the pastry squares over the filling, forming a triangle shape. Press the edges to seal and crimp with a fork.
Bake: Arrange the pastry rolls on the prepared baking sheet. Brush the tops with beaten egg for a golden finish.
Bake in the preheated oven for 15-20 minutes, or until the pastry is golden brown and puffed.
Serve warm as a delightful appetizer or snack.
Enjoy.