Good-Cooking - The Ultimate Chocolate Cake

Ingredients

• 2 cups unsifted flour
• 2/3 cup cocoa
• 1 1/4 teaspoons baking soda
• 1/4 teaspoon baking powder
• 1 2/3 cups granulated sugar
• 4 eggs
• 1 teaspoon vanilla extract
• 1 cup mayonnaise
• 1 1/3 cups water