In a large bowl, whisk together the flour, cocoa powder, baking soda, baking powder and salt. Set aside.
3 Cups Flour, 1 Cup Dutch Process Cocoa Powder, 1 teaspoon Baking Soda, 2 teaspoons Baking Powder, 1 teaspoon Salt
In a medium bowl, whisk together the oil, sour cream, eggs, vanilla, and white sugar.
1 Cup Vegetable Oil, 1/2 Cup Sour Cream, 4 Large Eggs, 1 1/2 teaspoons Vanilla Extract, 2 Cups Sugar
Stir the zucchini in and then pour the wet ingredients into the dry ingredients along with 3/4 cup of mini chocolate chips (Reserve a few of the chocolate chips to sprinkle on top of the muffins) and using a rubber spatula, fold until just combined.
4 Cups Zucchini, 2 Cups Mini Semi Sweet Chocolate Chips
Preheat oven to 350° F. Spray 3 8x5" bread pans (or 2 larger or 4-5 small) with nonstick spray.
Pour the batter just over 1/2 of the way full in each pan. Place some reserved chocolate chips on top of each batter.
2 Cups Mini Semi Sweet Chocolate Chips
Bake for 50-60 minutes at 350°. Touch the tops and if they don't sink in they are done (or until toothpick comes out clean or with just a few moist crumbs attached). Turn off the oven and open the door, gently sliding the rack out a little. Let them sit for a good 2-3 minutes then remove to cool on the counter on a wire rack.