Mayonnaise Cake With Chocolate Frosting - cooking recipe

Ingredients

For the cake
1 1/4 cups sugar
3 tablespoons cocoa, heaping
1 cup mayonnaise (Hellman's is a good kind)
2 cups flour
1 1/4 teaspoons baking soda, plus 1/8-1/4 teaspoon baking soda
1 cup cool water, plus 2-3 tablespoons cool water
1/4 teaspoon salt
1 teaspoon vanilla extract
For the frosting
1 1/3 cups powdered sugar
2 tablespoons cocoa
3 tablespoons butter
2 tablespoons milk
1/4 teaspoon vanilla extract

Preparation

For the cake: Preheat the oven to 350 degrees F and lightly grease a 9x12 baking pan.
Mix all ingredients in a medium bowl until you can't see any more flour.
Pour into the prepared baking pan and bake for 30 minutes.
Let the cake cool completely in the pan on a wire rack.
For the frosting: Place powdered sugar and cocoa in a medium bowl (I usually use a 4-cup Pyrex mesuring cup).
Heat butter and milk in a small microwave-safe bowl in the microwave until the butter is melted (be careful - if the heat is too high, it'll splatter!).
Gradually beat the butter mixture into the cocoa mixture until smooth.
Stir in vanilla.
Spread the warm frosting over the cooled cake. The frosting makes about a cup or so.