For best results, use a very ripe banana. The riper the banana, the sweeter and moister the pancakes will be. Shred the zucchini finely to ensure it integrates seamlessly into the batter. Adjust the amount of cocoa powder to your preference. For a richer chocolate flavor, add an additional half tablespoon. These pancakes are best enjoyed fresh. However, leftovers can be stored in an airtight container in the refrigerator for up to 2 days. Reheat gently in a skillet or microwave before serving.