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Chocolate Sheet Cake

Meet the Cook: The biggest compliment I've ever gotten on this cake might have come when I baked it for my son's 11th birthday party last fall. The children were full after eating pizza, veggies and dip, etc. - but each of them asked for seconds! -Dianne Medwid, Dauphin, Manitoba
  • Total Time
    Prep: 25 min. Bake: 20 min. + cooling
  • Makes
    20 servings


  • 2 cups sugar
  • 2 cups all-purpose flour
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1/2 cup butter, cubed
  • 1/4 cup baking cocoa
  • 1 cup water
  • 2 large eggs
  • 1/2 cup buttermilk
  • 1 teaspoon vanilla extract
  • ICING:
  • 1/2 cup butter, cubed
  • 1/4 cup baking cocoa
  • 1/3 cup milk
  • 2 cups confectioners' sugar
  • 1 teaspoon vanilla extract
  • 1 cup chopped walnuts


  • In a bowl, combine the first four ingredients; set aside. In a small saucepan, bring butter, cocoa and water to a boil. Immediately remove from the heat. Add to dry ingredients and mix well.
  • In a small bowl, beat eggs. Add buttermilk and vanilla; mix well. Stir into cocoa mixture. Pour into a greased 15x10-x1-in. baking pan. Bake at 375° for 20-22 minutes or until a toothpick inserted in the center comes out clean.
  • Meanwhile, in a saucepan, bring the butter, cocoa and milk to a boil, stirring constantly. Remove from the heat; add sugar and vanilla. Mix well. Spread over hot cake; immediately sprinkle with nuts. Cool completely on a wire rack.

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Average Rating:
  • Lily
    Feb 11, 2021

    Everyone loved this cake.

  • Charity and Faith
    Oct 18, 2018

    Everyone loved this cake, and it’s great if you need dessert for a crowd. This cake only took 15 minutes to bake, and no wait needed to ice it. The icing is amazing topped with pecans, reminds me of my grandmother’s fudge. We wanted to make 24 servings so we made 1.25 recipe using 3 leg. eggs and it fit perfectly in a 18 by 11 inch pan. Definitely a new favorite!!

  • Lynnell
    Apr 22, 2018

    I remember this recipe from 50 years ago. Mom was a home-ec teacher & used the recipe in her school kitchens. This time, I used pecans instead of walnuts, & the liquid from a 16 oz jar of maraschino cherries in place of milk in the batter. I chopped the cherries & added them to the batter. I felt 2 C of powdered sugar wasn't enough - the frosting was too runny, so I used 3 C of powdered sugar, and 1/2 C cocoa in the frosting. Next time - less milk in the frosting also.

  • BakerDeborah
    Aug 18, 2017

    Growing up, this was the cake my mom made for all occasions. Easy, yummy, fast, and could satisfy a crowd. Putting the frosting on while hot makes it soak into the cake for extra yummyness. Haven't tried it with the walnuts, though that sounds good, too.

  • TheDix
    Jul 15, 2016

    Good cake. I remember making it years ago with some added cinnamon. Two cups powdered sugar was not enough for the frosting. Four cups plus more would be better, too runny.

  • Peggie0203
    May 20, 2015

    Nice moist cake. I used 1/3 whole wheat flour, used only about one and a half cups of sugar (partly brown), and added about a teaspoon of instant coffee granules and more cocoa powder to enhance the chocolate flavour. I could not tell there was whole wheat flour in it. It was still sweet enough, and the flavour was very good.I did not make the icing, but sprinkled on some mini M&M's. That didn't work out, they sank down into the cake. Live & learn, right?Great recipe, in terms of tast, texture, and nutrition (especially with WW flour and reduced amount of sugar). This recipe is a keeper.rsa744, nutrition info is typically calculated on the first number listed when a range so offered. Ie., for this recipe the nutritional values should be based on 16 servings.

  • Nyc711
    Jan 26, 2015

    Great cake, moist and delicious ! everyone loved it , I followed the directions to the letter,will be making it again for my daughters birthday!

  • rsa744
    Jan 18, 2015

    Really great cake, I made whipped cream icing instead of the one directed. My question is the cake says serves 16-20, but the natritional facts dont say how many servings that is calculated on.

  • wheels222
    Nov 22, 2014

    It was to die for!!! Chocolate lover's dream cake!!! It was a big hit!!

  • mumarini
    May 4, 2012

    I make this often. It's very moist and always a hit!!