01 - Preheat oven to 350°F. Grease a 9-inch round cake pan and line bottom with parchment paper.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl. Set aside.
03 - Combine sugar with orange zest, lemon zest, and grated ginger in a large bowl. Rub mixture with fingertips to release citrus oils.
04 - Whisk eggs into sugar mixture until pale and slightly thickened.
05 - Add olive oil, orange juice, lemon juice, and vanilla extract. Whisk until smooth and well blended.
06 - Gradually fold dry ingredients into wet mixture, stirring gently until just combined. Avoid overmixing.
07 - Pour batter into prepared cake pan. Smooth top with spatula.
08 - Bake for 35 to 40 minutes until a toothpick inserted in center comes out clean and cake springs back lightly when touched.
09 - Let cake cool in pan for 10 minutes, then turn out onto wire rack to cool completely.
10 - Dust with powdered sugar and garnish with extra citrus zest before serving, if desired.