01 - Preheat the oven to 350°F. Lightly grease a 9x13 inch baking dish with cooking spray or a small amount of oil.
02 - Remove phyllo sheets from packaging and let them air-dry for 1 hour to become slightly crisp. Crumple the dried sheets into rough, irregular pieces by hand.
03 - In a large bowl, whisk together eggs and sugar until pale and thick, about 3-4 minutes. Add yogurt, oil, vanilla extract, orange zest, and baking powder. Mix until fully combined and smooth.
04 - Gradually fold the crumpled phyllo pieces into the batter, ensuring all phyllo is evenly coated. The mixture will appear thick and chunky.
05 - Pour the mixture into the prepared baking dish. Spread evenly and smooth the top surface with a spatula.
06 - Bake for 40-45 minutes until the pie is golden brown and a skewer inserted into the center comes out clean.
07 - While the pie bakes, combine water, sugar, orange juice, cinnamon stick, and orange zest in a saucepan. Bring to a boil, then reduce heat and simmer for 8 minutes. Remove cinnamon stick and orange zest. Let syrup cool completely.
08 - Remove the baked pie from the oven. While still hot, slowly pour the cooled syrup evenly over the entire surface. Let the pie soak for at least 2 hours before serving to absorb all the syrup.