Preheat oven to 350 degrees.
Shred zucchini with food processor, shredding blade.
Break up bananas and add to zucchini in food processor bowl. Mix throughly on low speed.
Add coconut oil, maple syrup, vanilla, baking powder, sea salt, cinnamon. Mix.
Pour mixture into large bowl.
For vegan option: In separate small bowl, add 4 tbsp Follow Your Heart egg replacement powder. Add 1 cup water, and whisk until smooth. Add to zucchini banana mixture.
For vegetarian option, add 2 eggs to zucchini banana mixture.
Add 3/4 cup of vegan chocolate chips.
Mix with large spoon, (not mixer or food processor) until flour is completely absorbed and no lumps remain.
Generously oil cast iron pan with coconut oil.
Pour mixture into cast iron pan. Bake for 45 minutes. Remove from oven and add 1/4 cup of chocolate chips to top. Return to oven and bake for an additional 15 minutes.