Step 1

Preheat the oven to 350°F and set rack in the middle position. Generously coat a muffin pan generously with non-stick cooking spray.

Step 2

In a medium bowl, whisk together the flour, baking soda, baking powder, salt, cinnamon and nutmeg. Set aside.

Step 3

In a large bowl, whisk together the melted butter and brown sugar. Add the eggs and vanilla extract and whisk to combine. Stir in the zucchini.

Step 4

Add the dry ingredients to the zucchini mixture and stir until just combined. Stir in ½ cup of the chocolate chips and all of the nuts (if using).

Step 5

Using a large spoon or ice cream scoop, divide the batter into the muffin wells, filling each almost completely. Sprinkle the remaining 2 tablespoons of chocolate chips onto the muffins, pressing them in lightly so they adhere. Bake for 20 to 22 minutes, or until a tester comes out clean. Allow the muffins to cool for 10 minutes in the pan, then transfer to a wire rack to continue cooling. Serve warm or room temperature.