Preheat the oven to 350 degrees. Coat an 11”x8” baking pan with cooking spray.
Combine the flour, baking powder, baking soda and salt in a large bowl.
Whisk together the eggs, sugar, yogurt, oil and vanilla extract. Stir in the zucchini and 1 ½ cups of the chocolate chips. Stir into the flour mixture and combine. Spread this into the baking pan and bake for 30 minutes or until lightly browned and a toothpick inserted in the center comes out clean.
Remove from the oven and sprinkle the rest of the chocolate chips over the top. As the chips melt, spread over the top with a spatula. If they don’t spread well, place back in the oven for about 1 minutes.