Preheat oven to 350˚F. Butter, cover the bottom with parchment paper, and re-butter 9" round cake pan.
Separate the eggs into two mixing bowls.
Mix together: olive oil, sugar, egg yolks, almond flour, baking powder, vanilla and/or almond extract, and orange zest.
Whip egg whites to stiff peaks. Mix a third of the whites into the batter, then fold in the rest gently. Don’t worry if it’s a little lumpy.
Bake 25-30 minutes at 350˚F. Remove from oven and let cool 10 minutes. Then run a knife around the edges and flip onto a plate. Prepare the Simple Chocolate Icing (usually I flavor it with Grand Marnier and orange zest for this cake).