1. Preheat and Prep:
Preheat your oven to 200°C (392°F) or 180°C (356°F) fan. Line a baking tray with parchment paper.

2. Cook the Spinach:
In a pan, heat olive oil over medium heat. Add minced garlic and cook for 1 minute. Add the spinach and sauté until wilted, about 2-3 minutes. Drain any excess liquid and allow it to cool slightly.

3. Make the Filling:
Chop the spinach and mix it in a bowl with crumbled feta cheese, 1 beaten egg, oregano (if using), salt, and pepper.

4. Prepare the Pastry:
Unroll the puff pastry and cut into 6 equal rectangles. Place them on the baking tray.

5. Fill and Seal:
Spoon the spinach and feta mixture onto one half of each rectangle, leaving space around the edges. Fold the other half over to create a pocket and seal the edges using a fork.

6. Egg Wash and Bake:
Brush the tops with a beaten egg for a golden finish. Bake for 18–22 minutes or until the tarts are puffed and golden brown.

7. Cool and Serve:
Allow them to cool slightly before serving. Enjoy warm or store for later!