01 - Preheat oven to 350°F. Lightly grease a 9x13 inch baking dish.
02 - Remove phyllo sheets from packaging and let them dry out for 1 hour, then 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 in crumpled phyllo pieces, ensuring they are evenly coated with the batter.
05 - Pour mixture into prepared baking dish and smooth the top.
06 - Bake for 40-45 minutes, or until golden and a skewer comes out clean.
07 - Combine water, sugar, orange juice, cinnamon stick, and orange zest in saucepan. Bring to boil, then simmer for 8 minutes. Remove cinnamon and zest; let syrup cool.
08 - When pie is done, remove from oven. While still hot, slowly pour cooled syrup evenly over pie. Let soak for at least 2 hours before serving.