Step 1

Preheat oven to 325 degrees.

Step 2

In a large bowl, combine the butter and sugar, beating until fluffy.

Step 3

Add eggs, one at a time, beating after each.

Step 4

Beat in the vanilla and yogurt.

Step 5

Stir in the flour, baking soda, baking powder, cocoa and cinnamon until well combined.

Step 6

Stir in the shredded zucchini.

Step 7

Spread mixture in a greased 9 x 13 inch pan or a greased 8 x 8 inch pan.

Step 8

Sprinkle with chocolate morsels and nuts if desired.

Step 9

Bake for approximately 30 minutes (9 x 13 pan) or 50 minutes (8 x 8 pan) or until a toothpick inserted in the center comes out clean.

Step 10

Let cool before cutting.