Grate the zest from one orange and juice it along with half of another orange. In a bowl, combine the orange juice and zest, eggs, and sugar. Beat with an electric mixer until well blended, about 3 minutes.

Add the olive oil and heavy cream, and continue mixing. Gradually add the cake flour, baking powder, and salt, mixing continuously. Once everything is combined, fold in the dark chocolate chips with a spatula. Pour the batter into a greased cake pan and sprinkle sugar on top.

Bake in the oven at 350°F (180°C) for about 40 minutes, or until a knife inserted in the center comes out clean. Let cool for about 10 minutes before removing from the pan.