Preheat oven to 350
In a large mixing bowl, beat the eggs and sugar until light and fluffy.
Add the banana, yogurt, milk, vanilla, and zucchini and mix well.
Add the flour gradually, mixing on low until incorporated. Mix in cocoa, baking powder, baking soda, and salt. Stir in chocolate chips, if desired, and pour into a greased 10" springform pan or a 9x13" baking pan. Bake 40 minutes or until tester inserted into the center of the cake comes out clean. Allow to cool completely.
Mix in cocoa, baking powder, baking soda, and salt.
Stir in chocolate chips, if desired, and pour into a greased 10" springform pan or a 9x13" baking pan. Bake 40 minutes or until tester inserted into the center of the cake comes out clean. Allow to cool completely.