Preheat oven to 325 degrees F.
Grease two 9x4" loaf pans or line 2 muffin pans with liners.
In medium bowl, combine flours, baking soda, baking powder, salt, and cinnamon.
In large bowl, beat together eggs and sugar until well combined, about 1 minute.
Add oil, Greek yogurt, and vanilla and beat until combined.
Add grated zucchini and fold in with spatula.
Add flour mixture to wet mixture and stir with spatula.
Fold in chocolate chips.
Divide batter evenly among loaf pans or muffin tins.
Bake muffins 15-18 minutes, until toothpick comes out clean.
Bake loaves 45-55 minutes, until toothpick comes out clean.