To prepare a chocolate zucchini cake iv recipe, first preheat the oven to 350?F (180?C) and grease and flour two 8-inch round cake pans. In the bowl of an electric mixer fitted with the paddle attachment, cream together the butter and sugar until light and fluffy. Add the eggs and vanilla and beat until combined. Gradually add the flour mixture, mixing after each addition until the batter resembles coarse crumbs. Fold in the zucchini. Bake the cake for 35 to 40 minutes or until toothpick inserted into the center comes out clean. Allow to cool before removing from the pan.