In a large bowl, whisk together the flour, cocoa powder, baking soda, baking powder and salt. Set aside.
1 ½ Cups Flour, ½ Cup Dutch Process Cocoa Powder, ½ teaspoon Baking Soda, 1 teaspoon Baking Powder, ½ teaspoon Salt
In a medium bowl, whisk together the oil, sour cream, eggs, vanilla, and white sugar.
½ Cup Vegetable Oil, ¼ Cup Sour Cream, 2 Large Eggs, 1 teaspoon Vanilla Extract, 1 Cup 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.
2 Cups Zucchini, 1 Cup Mini Semi Sweet Chocolate Chips
Divide batter evenly into muffin tins, filling all the way full. Place a few reserved chocolate chips on top of each muffin.
Preheat oven to 350° F. Line every other hole in two 12 cup muffin tins with cupcake liners. See note. Set the batter filled cups aside to rest while the oven heats. See post under "tips".
Bake for 15 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.
Notes
You do not have to do every other hole but it helps the air to circulate and give a taller dome to the muffins.
Keep in an airtight container at room temperature for 3 days or in the freezer for up to 1 month.
You can use 1/4 cup brown sugar and 3/4 cup white sugar if you're looking for a little more chew to the muffin tops