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Whoopie Pie Cake

Whoopie Pie Cake is an instant favorite for not only kids, but adults too! This delicious double-layer dessert is filled with sweet Marshmallow Buttercream! Try this easy chocolate cake recipe out at your next party!

Easy Double-Layer Chocolate Cake Recipe

Sometimes simple is better. Actually most times, yes? So this post is gonna be simple.

This Whoopie Pie Cake was sort of accidental.  Obviously not accidental in intention, but accidental in execution.

See, I was going to make this a super fancy, stack-o-whoopie pies piled up to make a giant gorgeous deconstructed type cake.

Unfortunately, ain’t nobody got time for that. Meaning me.  I ain’t got time for that. So I took the easy route.

It might not be as visually appealing as a giant stack of whoopie pies…I mean not much would…but it is incredibly tasty.

And also, you can actually slice it without holding your breath.

Which is kind of important, because I can only hold my breath for like 7 seconds before I’m certain I will faint.

Annnnnyway. Whoopie Pie Cake. Simple. Delicious. Make it.

How to Make a Whoopie Pie Cake With Cake Mix:

Whoopie Pie Cake | Cookies and Cups
Water being added to a stand mixer bowl

Just start with a chocolate cake mix.
Listen to the directions, then add an extra egg.
Grease 2, 9×13 pans with butter and dust with cocoa powder.

Collage of chocolate cake batter in 2 glass 9x13 pans
A baked 9x13 chocolate cake removed from the pan
Marshmallow fluff in a measuring cup
Whoopie pie filling piled on top of a 9x13 chocolate cake layer
Whoopie pie filling being spread on top of a chocolate cake layer

Split the batter evenly between the 2 pans.
(Obviously if you don’t have 2 pans, just bake one at a time.)
When the cakes are done, allow them to cool completely.
Meanwhile mix up your filling. I’m talking butter, powdered sugar and Marshmallow Fluff…
When the cakes are cooled, plop that filling on the top of one of the cakes…
  Spread it out evenly, and place the other cake on top.
Next make your chocolate ganache.
This is actually an optional step, but not really 😉

Overhead view of heavy cream and chocolate chips in a saucepan with a whisk
Chocolate ganache being poured over a chocolate cake layer
Collage of chocolate whoopie pie cake topped with chocolate ganache
Whoopie Pie Cake | Cookies and Cups

Just heat up some heavy cream to almost boiling and then add in your chocolate chips, stirring until smooth.
Cool the ganache slightly and pour that over the top of the cake…
Spread it to just about the edges of the cake and allow it to drip over the sides for dah-rama.
Let it set up a little bit and that’s it y’all.

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Whoopie Pie Cake

5 Stars 4 Stars 3 Stars 2 Stars 1 Star 4.9 from 7 reviews
  • Author: Cookies & Cups
  • Prep Time: 25 min
  • Cook Time: 20 min
  • Total Time: 55 min
  • Yield: serves 1215 1x
  • Category: Dessert
  • Method: Oven
  • Cuisine: American


Whoopie Pie Cake is an instant favorite for not only kids, but adults too! This delicious chocolate cake is filled with sweet Marshmallow Buttercream! Try this easy whoopie pie cake recipe out at your next party!




  • 1 box Chocolate cake mix (prepared per package directions) + 1 extra egg
  • *cocoa powder for dusting the pan


  • 1 cup butter, room temperature
  • 2 cups Marshmallow Fluff
  • 3 cups powdered sugar


  • 1/2 cup heavy cream
  • 1 cup semisweet chocolate chips



  1. Preheat oven to 350°
  2. Grease 2 9×13 sized pans with butter and dust with cocoa powder, set aside.
  3. Prepare cake according to package directions, but add in an extra egg to the mix.
  4. Split the batter evenly between the 2 pans and bake for 15-20 minutes until a toothpick comes out clean.
  5. Allow cakes to cool completely.


  1. In stand mixer beat butter and Fluff together until smooth.
  2. Turn mixer to low and slowly add in powdered sugar. Turning mixer back up, continue mixing for 30-60 seconds until smooth.
  3. Spread the filling on top of one of the cakes. Top the filling with the other cake.


  1. In small saucepan bring the heavy cream to almost a boil. Remove from heat and stir in chocolate chips. Allow to cool for 10 minutes and then pour over top of cake.


you could also bake this in 2 9×9 round pans


  • Serving Size: 1 slice
  • Calories: 507
  • Sugar: 60.9 g
  • Sodium: 405.1 mg
  • Fat: 19.3 g
  • Carbohydrates: 83.1 g
  • Protein: 3.3 g
  • Cholesterol: 11.2 mg

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127 comments on “Whoopie Pie Cake”

  1. Beth Gladfelter

    Ok so here’s my question….If I make this in a 9 x 13 couldn’t I just leave one of the cakes in the pan, top with filling and then put the other one on top? That way I wouldn’t have to take both the cakes out of their pan. Just wondering if that would work? Thanks!

  2. If made in 2 9x9s, how long is the cake baked for?
    I’ve made the 13×9 multiple times…..just saying, I eat half the filling before it makes it to the cake!

  3. I brought this to our Bible study group and it was a HUGE hit. Everyone raved about it! I added about 3/4 c mini chocolate chips to the cake batter, and I added some extra powdered sugar to the filling. I thought the filling tasted too much like butter before I added the extra powdered sugar. In hindsight, I wonder if a little vanilla might have been good in the filling. When it was all put together, the taste was amazing!

  4. This was DELICIOUS.I made the year-round cake. Glad I made it for someone else’s birthday and that it didn’t come home with me!

  5. you said this cake does not have eggs, but the recipe does call for one egg. Is there a way to make it without the egg?

    1. Hi, I don’t believe I ever stated this cake is egg free. It isn’t, there is actually 4 eggs in the recipe… 3 that are required by the box cake directions PLUS one extra egg.

  6. This recipe and picture made by mouth water by just looking and reading the recipe. It has to be delicious. There is a recipe called: Death by Chocolate. I think this could be the alternate name for this recipe. Thank you from this Chocoholic.

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