Step 1

PREHEAT oven to 350°. Grease and lightly flour two 9-inch round cake pans*; set aside.

Step 2

COMBINE flour, cocoa, baking soda and baking powder in medium bowl; set aside.

Step 3

BEAT eggs, sugar and vanilla in large bowl, with electric mixer at high speed, for 3 minutes or until light and fluffy. Beat in Hellmann's® or Best Foods® Real Mayonnaise at low speed until blended. Alternately beat in flour mixture with water, beginning and ending with flour mixture. Pour into prepared pans.

Step 4

BAKE 30 minutes or until toothpick inserted in centers comes out clean. Cool 10 minutes on wire racks; remove from pans and cool completely. Frost, if desired, or sprinkle with confectioners sugar.

Step 5

Optional Box Mix Chocolate Mayo Cake:BEAT cake mix, Hellmann's® or Best Foods® Real Mayonnaise, 1 cup water, eggs and cinnamon for 30 seconds in large bowl with electric mixer on low speed. Follow all other baking directions accordingly.