Preheat the oven to 350°F and grease a 9-inch cake pan.
In a bowl, whisk together the all-purpose flour, almond flour, baking powder, and salt.
In a separate bowl, beat the sugar and eggs until pale and fluffy.
Gradually whisk in the olive oil, orange juice, and orange zest.
Fold in the dry ingredients until just combined.
Pour the batter into the prepared pan and bake for 30-35 minutes or until a toothpick inserted comes out clean.
Let the cake cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.
Dust with powdered sugar before serving.