Don't have a clue why I haven't made it for a while. It is easy and it is really good. I got the recipe in 1974 from a neighbor, Connie Croyle while we lived in Fort Wayne, Indiana. I remember it well as that is when and where our youngest son Joel was born. (My baby, as I call him, is now 6' 4" grown married man.)
Mayonnaise Cake Ingredients:
1 C. sugar
4 T. cocoa or 2 squares unsweetened chocolate (I use cocoa)
1 C. cold water
1 1/2 t. baking soda
7/8 C. Miracle Whip
2 C. flour
pinch of salt
Stir all of the dry ingredients together and whisk until just combined. Add the Miracle whip and water and beat a minute or two with an electric mixer. Pour into prepared pan and bake until pick inserted into the center of the cake comes out clean, about 30-35 minutes. Cool completely and frost.
I had a little more than a pint of frosting left in the refrigerator from it's use as filling (option #2) in Oatmeal Whoopee Pies on 6/1/12. I let it come to room temperature and it was just perfect for topping a 9" x 13" cake.
Note: I have also made this and used Hellman's Mayonnaise ans it was fine.