Preheat oven to 350℉. Line an 8 inch round cake pan with parchment paper or grease with butter.
In a large bowl, add in the flour, baking powder, baking soda, sugar, salt and whisk together until combined.
In a medium bowl add in the egg, orange zest, orange juice, olive oil, yogurt, vanilla and whisk together until smooth. Pour the wet mixture into the dry mixture and mix together until just incorporated. Transfer fluffy batter to the cake pan and spread out evenly. Bake for 25-30 minutes or until toothpick comes out clean. Allow to set in pan for 10 minutes and then transfer to a wire rack. Allow to cool completely before serving. Top with powdered sugar and orange zest.