Preheat oven to 425°F. Spray a regular 12 capacity cupcake pan with nonstick cooking spray that contains flour, set aside.
In a medium size bowl whisk the flour, cinnamon, baking powder, baking soda, and salt.
In a large bowl whisk the eggs, sugar, zucchini, oil, and vanilla until well combined.
Add the dry ingredients to the wet ingredients. Using a large spoon or spatula, mix until partially combined (there should still be flour streaks remaining). Add the 1/3 cup chocolate chips and 1/3 cup mini chocolate chips (reserve the other 1/3 mini chips for topping) and use a rubber spatula to fold them into the batter. At this point, no flour streaks should remain.
Portion the batter into the prepared pan, filling ¾ full (generally want them to be a bit fuller! So they’ll get nice domes). Sprinkle the remaining 1/3 cup of mini chocolate chips over the tops of each muffin.
Bake for 5 minutes, then reduce oven temperature to 350°F and bake for 13-15 minutes or until a toothpick inserted in the center comes out with a few moist crumbs but no wet batter.
Remove from the oven and let cool in the pan for 5 minutes before turning out on a wire rack to cool to room temperature.
Store, covered, at room temperature for 4-5 days.
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Notes
Store baked muffins covered or in an airtight container at room temperature for 4-5 days. To freeze, let the muffins cool completely, then store in a freezer-safe bag or container in the freezer for up to 2 months. Remove and let thaw before enjoying. Warm in the microwave to make them taste like they just came out of the oven!