Chocolate-Zucchini Gateau

Directions

1. 1
   1. Grease a 9-inch square metal baking pan and line the bottom with parchment; grease the parchment.
2. 2
   2. In a large bowl, combine the flour, cocoa, baking powder, espresso powder and salt.
3. 3
   3. Using an electric mixer, beat the sugar, eggs and egg whites at medium-high speed until pale in color, about 3 minutes.
4. 4
   4. Whisk in the olive oil.
5. 5
   5. Stir in the zucchini
6. 6
   6. Stir in the flour mixture and 1 container yogurt alternately in 2 batches.
7. 7
   7. Pour batter into the prepared pan.
8. 8
   8. Bake until springy to the touch and a cake tester comes out clean, about 35 minutes. 9. Serve warm with the remaining yogurt or let cool and decorate with icing.