Created by sweety_Lisa on February 8, 2012
Step 1: Preheat oven to 350°F.
Step 2: In a mixing bowl, sift together flour, sugar, cocoa, baking soda and salt. Add vanilla, mayonnaise and water. Beat until smooth.
Step 3: Pour batter into a greased and floured 13x9-inch pan.
Step 4: Bake until a toothpick inserted in center of cake comes out clean (about 30-35 minutes).