Pre-heat oven to 350 degrees and grease two 8 in bread pans with non-stick spray.

Using an electric mixer or whisk, cream together sugar, yogurt, oil, eggs and vanilla.

In a medium bowl, whisk together both flours, cocoa, cinnamon, salt, baking soda and baking powder.

With mixer turned on low, gradually add dry mixture to wet until just combined.

Stir in zucchini and chocolate chips. (Tip: If you lightly mix the chocolate chips in a dusting of while flour, they won't sink to the bottom of the bread while baking.)

Divide mixture evenly between both bread pans and bake for 45-50 minutes or until toothpick comes out clean.