Step 1

Prepare muffin tins by lining with 24 muffin cups, or greasing cups.

Step 2

Preheat oven to 350° F

Step 3

In a stand mixer, or large mixing bowl, add eggs and brown sugar.

Step 4

Using a stand mixer, or hand mixer, beat for approximately 10 minutes or until it has thickened.

Step 5

Mix in vegetable oil, and melted, cooled chocolate. (do not add hot chocolate as it will cook the eggs)

Step 6

In a small mixing bowl, add flour, baking soda, baking powder, and salt. Stir to mix.

Step 7

Pour flour mix into the egg mix. Mix until just combined.

Step 8

Add zucchini and walnuts. Stir to combine

Step 9

Using an ice cream scoop, fill the 24 muffin cups ⅔ full.

Step 10

In preheated oven, bake approximately 20 minutes, or until a toothpick inserted into the center comes out clean.

Step 11

Place pan on a cooling rack for 10 minutes, or until cooled.

Step 12

Top cupcakes with chocolate frosting.

Step 13

Garnish top with whole walnut if desired.