Use large baking trays and line with baking paper. Preheat oven to 200°C.
Roll out pizza dough on lightly floured work surface to 5 mm thick. Whisk egg yolk with 2 tbsp water; brush over dough. Cut dough into 6 cm squares to make 36 in total.
Combine topping ingredients; sprinkle over the squares. Place on baking trays and cook, one tray at a time, for 10–15 minutes or until pastry is golden. Remove from the trays, cool briefly and serve warm.
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For Turkish Feta Pastries, roll out 400 g pizza dough into a thin sheet. Sprinkle crumbled feta over one half of the dough. Fold over the other side; press to seal. Bake in a preheated 200°C oven for 20–25 minutes. Remove from oven, cut into pieces and serve.