Preheat oven to 350ºF. (on regular bake setting and nor convection bake). Butter a 9” round or spring-form pan and line with a circle shape parchment paper.
Mix the dry ingredients (both flours, sugar, baking powder, baking soda and kosher salt) together in a large bowl. Create a well in the flour mix and add olive oil, milk, and eggs and whisk into the flour mixture. Add orange zest and juice and stir until completely combined and there are no lumps.
Pour batter into the prepared pan. Bake for 50 minutes or until a toothpick inserted comes out clean.
Allow to cool for at least 10 minutes before slicing. Sprinkle with powdered sugar, if desired. Enjoy!
