01 - Preheat the 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 them into rough pieces.
03 - In a large bowl, whisk together eggs and sugar until pale and thick. Add yogurt, oil, vanilla, orange zest, and baking powder; mix well.
04 - Gradually fold in the crumpled phyllo pieces, ensuring they are evenly coated with the batter.
05 - Pour the mixture into the prepared baking dish and smooth the top.
06 - Bake for 40 to 45 minutes, or until the pie is golden and a skewer comes out clean.
07 - Combine water, sugar, orange juice, cinnamon stick, and orange zest in a saucepan. Bring to a boil, then simmer for 8 minutes. Remove cinnamon and zest; let syrup cool.
08 - When the pie is done, remove from oven. While still hot, slowly pour the cooled syrup evenly over the pie. Let it soak for at least 2 hours before serving.