2 cups flour
1 1/4 tsp. baking soda
1 tsp. salt
1 cup sugar
3/4 cup mayonnaise
1 cup water
1 tsp. vanilla
4 tbsp. cocoa

Preheat oven to 350°F.

Put all ingredients in a bowl and mix very well.

Bake in an 8x12-inch pan at 350°F for 30 minutes.