Preheat oven to 350 degrees. Grease cookie sheets. In a medium bowl, cream together the margarine, white sugar and brown sugar until smooth. Beat in the egg and vanilla. Combine the flour, cocoa, baking soda and salt; gradually stir into the creamed mixture. Fold in the grated zucchini. Fold in chocolate chips.

Drop by rounded spoonful onto the prepared cookie sheets. Bake for 8 to 10 minutes in the preheated oven. Allow cookies to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely. Makes approximately 3 dozen cookies.