How To Make Mayonnaise Cake

Here is the recipe:
2 cups all-purpose flour
2/3 cup unsweetened cocoa powder
1 1/4 tsp. baking soda
1/4 tsp. baking powder
3 eggs
1 2/3 cups sugar
1 tsp. vanilla extract
1 cup Hellmann's® or Best Foods® Real Mayonnaise
1 1/3 cups water
#Chocolate Buttercream Frosting
1½ cups butter (3 sticks), softened
1 cup unsweetened cocoa
5 cups confectioner’s sugar
½ cup milk
2 teaspoons vanilla extract
½ teaspoon espresso powder

--Preheat oven to 350°. Grease and lightly flour two 9-inch round cake pans*; set aside.
--In medium bowl, combine flour, cocoa, baking soda and baking powder; set aside.
--In large bowl, with electric mixer at high speed, beat eggs, sugar and vanilla 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.
--Bake 30 minutes or until toothpick inserted in centers comes out clean. On wire racks, cool 10 minutes; remove from pans and cool completely. Now prepare frosting.
--Add cocoa to a large bowl or bowl of stand mixer. Whisk through to remove any lumps.
--Cream together butter and cocoa powder until well-combined.
--Add sugar and milk to cocoa mixture by adding 1 cup of sugar followed by about a tablespoon of milk. After each addition has been combined, turn mixer onto a high speed for about a minute. Repeat until all sugar and milk have been added.
--Add vanilla extract and espresso powder and combine well.
--If frosting appears too dry, add more milk, a tablespoon at a time until it reaches the right consistency. If it appears to wet and does not hold its form, add more confectioner’s sugar, a tablespoon at a time until it reaches the right consistency.