Step 1. Preheat oven to 150°C. Grease thoroughly a 12-cup Bundt pan (or 6-cup Bundt pan and bunny cakelet pan 4.5 cup).
Step 2. Place in a food processor flour, cocoa powder, bi-carb and salt. Pulse to mix the dry ingredients.
Step 3. Grate zucchini and squeeze out the water between two sieves or use a muslin cloth. Set aside.
Step 4. In a mixer, beat the eggs and sugars until light and creamy. Slowly add in EVOO. Add in yogurt. Mix in the zucchini. Fold in the flour mixture. Add in the melted chocolate.
Step 5. Spoon mixture into greased Bundt pans. Bake 35-40 minutes or when tested with a skewer, it comes out clean. Cool on a wire rack for 10 minutes and turnout cake onto a serving plate. Dust with cocoa powder before serving .
Note: Smaller cakelet pan takes shorter time to bake.