01 - Preheat oven to 350°F. Lightly grease a 9x13 inch baking dish.
02 - Remove phyllo sheets from packaging and let dry for 1 hour. Crumple into rough pieces.
03 - Whisk eggs and sugar until pale and thick. Add yogurt, oil, vanilla, orange zest, and baking powder. Mix well.
04 - Gradually fold crumpled phyllo pieces into batter, ensuring even coating.
05 - Pour mixture into prepared baking dish and smooth top. Bake for 40-45 minutes until golden and a skewer comes out clean.
06 - Combine water, sugar, orange juice, cinnamon stick, and orange zest in saucepan. Bring to boil, then simmer 8 minutes. Remove cinnamon and zest. Let syrup cool.
07 - Remove pie from oven. While hot, slowly pour cooled syrup evenly over pie. Let soak at least 2 hours before serving.