Preheat oven to 350°. Coat a 13x9-in. baking pan with cooking spray.
In a large bowl, beat sugar and oil on medium speed 1 minute. Add eggs, applesauce and vanilla; beat 1 minute longer. In another bowl, whisk flour, cocoa, baking soda and salt; add to sugar mixture alternately with buttermilk, beating just until blended. Stir in zucchini.
Transfer to prepared pan. Bake 20 minutes. Sprinkle with chocolate chips and pecans. Bake 10-15 minutes longer or until a toothpick inserted in center comes out clean. Cool in pan on a wire rack. Yield: 18 servings.
Notes
To toast nuts, bake in a shallow pan in a 350° oven for 5-10 minutes or cook in a skillet over low heat until lightly browned, stirring occasionally.