Whoopie Pie Cake

This Easy Whoopie Pie Cake is an instant favorite..filled with delicious Marshmallow Buttercream!

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.



Whoopie Pie Cake.

Simple. Delicious. Make it.

Whoopie Pie Cake | Cookies and CupsJust start with a chocolate cake mix.
 photo IMG_9469_zpse813d347.jpgListen to the directions, then add an extra egg.
Grease 2, 9×13 pans with butter and dust with cocoa powder.

Split the batter evenly between the 2 pans.
(Obviously if you don’t have 2 pans, just bake one at a time.)
 photo PicMonkeyCollage_zps25ef02d4.jpgWhen the cakes are done, allow them to cool completely.
 photo IMG_9485_zps15f6410b.jpgMeanwhile mix up your filling. I’m talking butter, powdered sugar and Marshmallow Fluff…
 photo IMG_9482_zps46addd2f.jpgWhen the cakes are cooled, plop that filling on the top of one of the cakes…
 photo IMG_9489_zps1af9d40c.jpg  Spread it out evenly, and place the other cake on top.
 photo IMG_9497_zpsb657447b.jpgNext make your chocolate ganache.
This is actually an optional step, but not really 😉

Just heat up some heavy cream to almost boiling and then add in your chocolate chips, stirring until smooth.
 photo IMG_9501_zpse407e526.jpgCool the ganache slightly and pour that over the top of the cake…
 photo IMG_9505_zps14c463e8.jpgSpread it to just about the edges of the cake and allow it to drip over the sides for dah-rama.
 photo PicMonkeyCollage2_zps71f1bda2.jpgLet it set up a little bit and that’s it y’all.
Whoopie Pie Cake | Cookies and Cups




serves approx 12-15



  • 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


119 Responses

  1. Jeannine DiBart

    This looks amazing!!! I absolutely love whoopie pies, and think the idea of turning it into a cake is brilliant:)

  2. Gayle Owen

    I work at a restaurant and always bring the staff treats on the weekends. Guess what they are getting this weekend. Think I’ll make in the round pans to look like a giant whoopie pie. Thanks for the idea.

    1. Darlene Berry

      Gayle that is such a nice idea for your staff. You must have a wonderful staff & they really care a great deal for you. Hope your giant woopie turn out good. I have to try this recipe. It looks too yummy to pass up.

  3. I’m having one of those days….no, scratch that. I’m having one of those WEEKS when a decadent whoopie pie cake like this could really make the sun shine a little brighter… Soooooo…wanna fly one across country for me? Pretty please? 😉 Seriously, this is just crazy awesome, Shelly.

  4. I do love me some crazy layer cakes…but sometimes I also just want two chocolate layers with some vanilla sandwiched in between. This cake is perfecto for that!

  5. Laurie P

    this could be the best thing I ever ate — made it in two 9″ pans, for Memorial Day picnic, and it disappeared so fast it left a cloud of dust (crumbs?) Thanks for a great recipe, it’s a keeper!

  6. Jackie

    Your whoopie cake looks awesome! What cake mix brand did you use? I want to bake this cake this weekend, just want to make sure I buy the same cake mix you used. Thanks!

  7. I am making your whoopie pie cake tomorrow for my beau’s birthday and I have every bit of faith it will be fantastic!
    He’s from Maine where whoopie pies are as necessary as breathing and when I found your recipe I jumped for joy.
    Thanx so much!!!!!

  8. Jen

    Help! I so want this to be amazing, but I made it today and my “fluff” didn’t really fluff. Your picture looks white and fluffy and marshmallow-y. But mine came out sort of yellow (the butter) and too runny. What could I have done wrong and how do I fix it when I try again? Thanks!

  9. Brittney

    Just made this tonight for the second time. It’s been a huge hit with my family! Thanks so much for the awesome recipe 🙂

  10. Diana

    I make Whoopie Pies all the time and I love this idea quicker and eaiser. One day I was making them and the Peanut Butter was yelling at me to mix in the filling….I used half fluff and half peanut butter and WOW it is amazing. thanks for the cake idea.

  11. Caryn

    This looks amazing! I am making it for Mother’s Day for myself…and all the family. Does it need to be refrigerated after it’s made? Thanks for sharing!

  12. Amy D

    I just finished swirling on the ganache. This cake will be a knockout at the 4th of July BBQ tomorrow! I used an 11″ X 14″ X 1″ deep cake pan to make the layers with parchment paper on the bottom. I followed the same cake recipe and baked it for 15-18 minutes. I wish I doubled the filling. The cake layers at this size have a bigger area. The current filling was plenty to cover it; I personally like more filling. Can’t wait to have a piece of this!

  13. Agerceciliahernandez

    Just thought I would let you know I got here by following a link fir egg free recipes, & this was not. Both my girls are allergic to eggs so I was excited to see this recipe noted as “not an egg in site”. Not only do boxed cake mixes call for eggs, but marshmallow fluff also contains egg as well. Looks great & yummy, but very disappointed, & just thought I would let you know in case others had allergies as well.

    1. Shelly

      What site referred you? For the most part I don’t really know when sites link to me. Sorry about the confusion on their part, but this cake definitely has eggs in it.

  14. Linda

    Marshmallow Fluff is made from Egg Whites – so this is not an egg free recipe. Many people with an egg allergy are allergic to the white!

  15. Bobbi

    I am going to try this gluten free. It looks delish!
    To Dani above me…. I have made the fluff without butter. Use Spectrum palm shortening. Use dairy free chocolate chips and the extra creamy thick part of a can of coconut milk in place of heavy cream or actually, you can use any non-dairy milk for the ganache.

  16. merle

    Bobbi, are you going to use a GF cake mix and still add the extra egg? Am curious to know how it comes out as I’d like to do the same! thx

  17. merle

    just wanted to let you know I made this with a better batter Gluten Free cake mix and it came out awesome. a little too much filling, but who can really have too much frosting? the ganache put it over the top – perfect for super bowl sunday!! thank you 🙂

  18. Mary Adams

    I made this for the superbowl, it was only the 4 of us so I took some into work, now I have requests for it. I am making one today for an Eagle Scout work day but with fudge marble cake.

  19. Bev

    I want to make this cake this weekend and wanted to know if you can freeze any leftovers. There is just the two of us and my husband doesn’t eat a lot of sweets he usually only takes a taste and that’s it.

    1. Carrie


      Marshmallow fluff is also called marshmallow creme in some places. It is a marshmallow flavored creamy stuff usually found in the baking section.

  20. is there a reason to bake two separate cakes? Could you bake one 9×13 and slice it in half? I realize it might be a little crumby that way, but any other reason? Thanks!!

  21. Carrie


    Marshmallow fluff is also called marshmallow creme in some places. It is a marshmallow flavored creamy stuff usually found in the baking section.

  22. Andrea

    This looks amazing!! Can’t wait to make it this weekend. One question, would the filling still work if I only use 1/2 cup butter? Don’t get me wrong, it would be heavenly for sure…but I’m not sure my heart can handle that much butter!! Ha ha!!

  23. Doc

    I don’t know how to bake and no one else in my household does, so I will just sit in the corner and cry. Don’t pay any attention to me. Thanks for the pictures and all of the posts. That cake, a gallon of vanilla ice cream and hot, black coffee would be the perfect day before death for me. Thanks.

  24. We have a 14 year old border collie and wanted to celebrate her birthday. My niece suggested we choose a dessert that was black and white to go along with our Julie Dog- your whoppie cake was perfect! It was easy and delicious! The whole family loved it! Thanks so much!

  25. Debra Rosenberg

    This cake is listed as egg free, then tells you to add an extra egg beyond what’s called for on the box of cake mix. Very disappointing……

  26. Patty

    I made this cake for my family dinner and they just loved it. It really does taste like a Hostess cupcake, only better. It is delicious and rich tasting. Now they are asking me to make it again. Thanks for the recipe.

    1. Shelly

      Oh yes, of course! Using a brownie, though, might be too dense, and when you slice it the filling might squeeze out 🙂

  27. 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.

    1. Shelly

      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.

  28. Pingback : Chocolate, Chocolate, & More Chocolate Recipes | The Sparrow's Home

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