Preheat your oven to 400°F (200°C) and prepare a baking sheet lined with parchment paper.

In a skillet, heat olive oil over medium heat and sauté chopped spinach for about 3-4 minutes until wilted. Let cool.

In a mixing bowl, combine cooled spinach, ricotta cheese, grated Parmesan, garlic powder, salt, and pepper. Mix until smooth.

Roll out thawed puff pastry sheets on a floured surface and cut into 4-6 squares.

Place 1-2 tablespoons of the spinach mixture in the center of each square, fold and seal the edges.

Brush the tops of the pastries with beaten egg or plant-based milk, if vegan.

Bake on the lined baking sheet for 20-25 minutes until golden brown.

Let cool for 5 minutes before serving with tzatziki or marinara sauce.