Pre-heat oven to 350F (conventional) and line a 9" springform pan (or a 9x3" round pan) with parchment paper
In a large bowl, add all the wet ingredients along with the orange zest. Whisk until combined
Add the sugar and whisk again for 1 minute
Sift in all the remaining dry ingredients, and use a rubber spatula to gently fold until the ingredients are combined and no lumps of flour remain. Do not overmix
Pour the batter into the prepared pan, and sprinkle over some more sugar on top (optional)
Bake for ~50-55 minutes until a toothpick inserted in the middle of the cake comes out with moist crumbs attached
Let the cake cool for 20 minutes, then remove from the pan
Dust with powdered sugar, and serve!
