Step 1

Preheat oven to 350 degrees F. Line with paper liners or grease a 12 standard size muffin tin. Set aside.

Step 2

In large bowl, whisk together the flour, sugar, baking soda, ground cinnamon, and salt.

Step 3

In a 4 cup glass measuring cup, whisk together egg, oil, buttermilk, and vanilla. Pour into flour mixture and mix until it just starts to come together. (Visible flour is ok. It will be dry at this point and doesn't need to be completely mixed. )

Step 4

Add in zucchini and mix to combine. The moisture from the zucchini will allow the dry ingredients to be completely incorporated into the wet ingredients. Take care not to over mix. Over mixing will create a tough crumb.

Step 5

Gently stir in chocolate chips and walnuts.

Step 6

Divide batter equally between 12 prepared muffin wells.

Step 7

Bake for 20 to 25 minutes, or until a toothpick inserted into the center comes out clean. Let rest in muffin tin for 2 minutes, then remove to wire rack to cool completely.