In a large bowl, whisk together the eggs, sugar, and orange zest.
Add a pinch of salt and continue whisking until well combined.
Slowly drizzle in the vegetable oil and orange juice while whisking continuously. Ensure all ingredients are fully incorporated.
In a separate bowl, whisk together the flour and baking powder. Sift the dry ingredients into the wet ingredients.
Mix until all the ingredients are fully combined.
Preheat your oven to 180°C (360°F) and grease a 24cm/9-inch cake pan. Pour the batter into the prepared pan.
Bake the cake for 40 minutes, or until a toothpick inserted into the center comes out clean.
Allow the cake to cool completely in the pan before transferring it to a wire rack to cool completely. Dust the cooled cake with powdered sugar before serving.
