In a bowl, combine Miracle Whip, water and vanilla. Combine the flour, sugar, cocoa, baking soda and salt. Add to salad dressing mixture and beat until mixed. Transfer to a greased and floured 10-in. fluted tube pan (pan will not be full).
Bake at 350° for 35-40 minutes or until a toothpick inserted in the center comes out clean. Cool for 10 minutes before removing from pan to a wire rack. Dust with confectioners' sugar if desired.
Editor's Note: This recipe was tested using Miracle Whip brand salad dressing. Light or fat-free Miracle Whip may not be substituted for regular Miracle Whip.