Ready to dive into making this delicious dish? Follow these steps, and you’ll have a batch of pastries ready to delight your taste buds:

1. Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
2. In a skillet, heat the olive oil over medium heat. Add the garlic and sauté for about 30 seconds until fragrant.
3. Add the chopped spinach to the skillet, cooking until wilted, about 2-3 minutes. Season with salt, pepper, and oregano if using. Remove from heat and let cool slightly.
4. In a large bowl, combine the ricotta, feta, Parmesan, and the cooled spinach mixture. Mix well to incorporate all ingredients.
5. Roll out the puff pastry on a floured surface and cut each sheet into squares—about 4-5 inches each.
6. Spoon a generous tablespoon of the spinach and cheese mixture onto each square.
7. Brush the edges of the pastry squares with beaten egg, then fold the corners to center. Pinch to seal the edges.
8. Place the pastries on the prepared baking sheet. Brush the tops with the remaining egg wash for a golden finish.
9. Bake in the preheated oven for 15-20 minutes or until golden brown and puffed.
10. Allow to cool slightly before serving warm. Enjoy the melty, cheesy goodness!

Remember, don’t stress about the perfect seal; some filling might ooze out, but that’s part of the charm!