Chocolate Sheet Cake

05.01.2016

This addictive chocolate sheet cake is simply everything. The secret is in the double cocoa (yes, double!) whipped chocolate cream topping, and fresh strawberries. This is the best chocolate cake!

Chocolate Sheet Cake on Plate with Strawberries and mint garnish

My Ode to Chocolate Sheet Cake

Chocolate!! Life needs chocolate, period. Would I survive without chocolate? Maybe. Would I be an enjoyable person without chocolate in my life? No. Does that make me an emotional eater? Probably, but I’m cool with that.

Really though, I love love love chocolate, and I also love love love chocolate cake! It is after all two of the absolute best foods combined into one so of course that makes it one of the most epic things in the world of food, right? Yes, of course that statement is right and it’s not to be argued with :). I think it’s safe to say this Chocolate Sheet Cake will have everyone swooning!

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Creamy chocolate topping poured onto Chocolate Sheet Cake

Why this is the Best Chocolate Cake

Why is this homemade chocolate cake any different from all those out there? Because I’ve always doubled the cocoa from that in the classic chocolate sheet cake recipe and it makes it 1,000 times better! I mean 1/4 cup cocoa most definitely could not be considered enough for a whole cake!

I also chose to finish this one off with some chocolate whipped cream for extra decadence (it tastes like chocolate mousse), but it is optional so if you want to cut back on ingredients feel free to leave it off.

Then of course I like to add some fresh strawberries because strawberries and chocolate just go together, plus they add that gorgeous red color.

Best chocolate cake cut into squares and topped with chocolate mousse and strawberriesChocolate Sheet Cake Squares with chocolate mousse and strawberries

Easy On-Hand Ingredients

Chances are you already have all of the ingredients to make this chocolate sheet cake (if you don’t have buttermilk just measure out 1/2 cup milk, remove 1 1/2 tsp of it then replace that with 1 1/2 tsp white vinegar or lemon juice. Stir and let it rest 3 minutes), so…you should probably make the best chocolate cake you’ve ever made right this minute (then share with your neighbors and friends or you’ll be eating the whole thing for days. This chocolate sheet cake is addictive)!

Full pan of chocolate sheet cake topped with bright red strawberries Spatula serving homemade chocolate cake from sheet pan

Print

Chocolate Sheet Cake

5 from 1 vote

Ingredients

Cake

  • 1 3/4 cups (248g) all-purpose flour
  • 2 cups (410g) granulated sugar
  • 1 tsp baking soda
  • 3/4 tsp salt
  • 1 cup (226g) unsalted butter
  • 1/2 cup (48g) unsweetened cocoa powder, plus more for dusting
  • 1 cup (235ml) very hot water
  • 1/2 cup (120ml) buttermilk
  • 2 large eggs
  • 2 tsp vanilla extract

Chocolate Icing

  • 1/2 cup (112g) unsalted butter, diced into cubes
  • 1/3 cup (33g) unsweetened cocoa powder, sifted
  • 1/8 tsp salt
  • 6 Tbsp milk
  • 1 1/2 tsp vanilla extract
  • 3 1/3 cups (430g) powdered sugar, sifted
  • Brown sprinkles (optional)
  • 20 - 24 fresh small strawberries (optional)
  • Chocolate Whipped Cream (optional, see notes)

Instructions

  1. For the cake:
  2. Preheat oven to 350 degrees. Butter a rimmed 18 by 13-inch baking sheet (average size cookie sheet) and dust lightly with cocoa powder and tilt to evenly coat, set aside. In a mixing bowl whisk together flour, sugar, baking soda and salt for 20 seconds, set aside.
  3. Add butter to a large microwave safe mixing bowl. Heat in microwave until melted. Whisk in cocoa powder and water. Pour flour mixture into butter mixture and using an electric hand mixer, blend until well combined. Add in buttermilk, eggs and vanilla and mix on low speed for about 45 seconds. Pour mixture into prepared baking dish. Bake in preheated oven until toothpick inserted into center of the cake comes out clean, about 23 - 26 minutes. Remove from oven and set on a wire rack to cool, immediately begin to make icing (you want to ice the cake while it's still really warm so it stays really moist and sort of absorbs some of the icing).
  4. For the icing:
  5. Add butter, cocoa powder, salt and milk to a medium saucepan. Cook over medium heat, stirring constantly, until butter has melted. Remove from heat, whisk in vanilla and powdered sugar (if mixture is thick return to medium-low heat and warm, stirring constantly, until it has thinned. It should be a nice pourable consistency). Immediately pour icing over warm cake and spread into an even layer. If using sprinkles add immediately before icing begins to set. Allow icing to set at room temperature. Cut into squares, if using chocolate whipped cream add just before serving and a strawberry to each slice.
  6. Recipe source: inspired by Taste of Home and Grandma's cake

Recipe Notes

If you'd like to add the chocolate whipped cream: whip 3/4 cup + 2 Tbsp heavy cream in mixing bowl using an electric hand mixer until soft peaks form. Add in 2 1/2 Tbsp cocoa powder, 3 1/2 Tbsp granulated sugar and 1/2 tsp vanilla and whip to stiff peaks. Chill until ready to use.

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Best chocolate cake in sheet pan topped with mousse and strawberries

25 comments

  • Kristin: Okay, so I have a confession. I’ve had this recipe pinned for months… maybe even a year or more. It was just never on my top of new dessert recipes to try, because it didn’t seem too exciting. However, I finally decided to try it today, since my family is SO picky about desserts, but I knew they all liked chocolate, and I had all the ingredients already. (Most of my boys would rather settle for candy for dinner dessert than eat what I’ve made… and it’s not because I’m bad at baking. They’re that picky.) Anyway, this got rave reviews from everyone. It’s amazing for me to find a dessert that everyone likes. My oldest son said, “You should make this more often.” This cake is perfectly chocolaty, easy, and has a fantastic crumb. BTW, you always know how to present even the simplest of desserts in such a beautiful way. This is definitely a keeper, and I think I’ll be making it fairly often. I also love that it has ingredients that I always have on-hand. Thank you for another great recipe! Glad I finally tried it! :D October 4, 2017 at 7:27pm Reply

    • Jaclyn: Thanks for the great review Kristin! So glad your family loved it! October 8, 2017 at 4:10pm Reply

  • AGS: Another great cake from your kitchen. I do have a few fav chocolate recipes and really didn’t think I would add another to the list but I now have to.

    Thanks again September 18, 2016 at 1:11am Reply

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