Lay open the phyllo sheets on your working surface. Let them sit on room temperature for at least half an hour (so they will air dry)
Preheat oven to 180°C/356°F.
Beat eggs on medium speed on the electric mixer. Add sugar slowly. Small bits at a time. Beat eggs until they start to become foamy .
Add the yogurt, vanilla extract, orange zest and baking powder.
Continue beating and pour in slowly the oil. Once fully combined, remove from mixer and set aside.
Cut the phyllo sheets to 4 pieces lengthwise. Take each phyllo piece and crumble it with your hand. Add to the pan.
Add a few more, until you slightly cover the bottom. Pour some of the egg mixture on top of the crumbled phyllo sheets.
Use the rest of the phyllo sheets exactly the same way. Once you used all the phyllo pour the remaining egg mixture on top. Bake for about 30-40 minutes.