Key Lime Whoopie Pies

Key Lime Whoopie Pies | Cookies and Cups

I have a little guy home from school this week because he’s sick.

It’s a little introduction into summer break for me.

I thought I was ready.

I’m not ready.

The endless episodes of Pokemon on a loop…the eating….ALLTHEEATING…the “Can blah blah blah come over?”…the “sleeping in” which is a made up imaginary thing…because my kids seem to like to get up EARLIER on days when they have no school…major fail kids…and the in and out, in and out, in and out…

Don’t get me wrong, I love the bejeezus out of my kids.   But I straight lock my doors when they go outside anymore.

Because without a doubt 2 minutes after they go out, they will be back in.

And then out.

And thennnn back in.

I air condition my back deck, which is really not expensive at all…

So yeah, summer break for us is almost here (I know a lot of you having been dealing with all the things for a few weeks already) and even though I thought I was ready, I’m starting to second guess my sanity.

Pray for me.

And then make these Key Lime Whoopie Pies.

The end.

Key Lime Whoopie Pies | Cookies and Cups

As you know, I am addicted to Key Lime anything.  Here are some of my past recipes.

Luckily lime is fruit, so I feel 1/8 less guilty about it.

Also these whoopie pies are basically an inside-out cupcake.  Did I just invent something?  An inside-out cupcake?  Don’t google that, I call dibs.

Let’s start.

Get a box of cake mix.  Add some oil, water and eggs…oh and also a cup of graham cracker crumbs… photo IMG_1206_zps92d4ea10.jpg

Mix that up for a minute or so.  photo IMG_1207_zps74409ccd.jpgIt’ll get thick and pretty.

 photo IMG_1212_zpsf06bd2f3.jpgOn a parchment lined baking sheet, spoon batter into circles about two inches apart…

 photo IMG_1214_zps55344571.jpgThey’ll bake up nice and domey!

 photo IMG_1224_zps9437c942.jpg

While they’re cooling, go ahead and make your filling.

Start by zesting a few limes… photo IMG_1232_zpsae68eafc.jpg

Then add that into some cream cheese, powdered sugar and key lime juice… photo IMG_1233_zpsfe1defb4.jpgI used a piping bag for easy filling…

 photo IMG_1235_zps5fc2ad62.jpg

And squish the filling between 2 cookies… photo IMG_1237_zps345512c5.jpgI dipped half of each sandwich into some extra graham cracker crumbs.

I was feeling fancy.

Key Lime Whoopie Pies | Cookies and Cups

I might have eaten 13 of these.  So good.Key Lime Whoopie Pies | Cookies and Cups

Key Lime is in the air over at Confessions of a Cookbook Queen too!  Hop over and check out Kristan’s Key Lime Eclairs… how good do those sound?!


Key Lime Whoopie Pies



  • 1 box yellow cake mix (or vanilla)
  • 1 cup graham cracker crumbs
  • 1/2 cup canola oil
  • 1/2 cup water
  • 3 eggs


  • 1 (8 oz) block cream cheese, room temperature
  • 4 cups powdered sugar
  • 1 Tbsp Lime Zest (about 2 limes)
  • 3 Tbsp Key Lime Juice (about 2 limes)
  • *optional ~ graham cracker crumbs for garnish


  1. Preheat oven to 350°
  2. Line baking sheet with parchment paper.
  3. In mixing bowl combine cake mix, graham crumbs, oil, water and eggs. Stir to combine and then beat on medium high for 1 minute.
  4. Drop batter (approx 2 Tbsp) onto lined baking sheet, 2 inches apart.
  5. Bake 9-11 minutes until set and edges are lightly golden. Transfer to a wire rack to cool completely.
  6. For filling combine cream cheese, powdered sugar, zest and lime juice in bowl of stand mixer. Mix on low until ingredients combine, Turn mixer up to medium and beat for 1 1/2-2 minutes until smooth and creamy.
  7. Fill whoopie pies with about 2 Tbsp of filling.
  8. Garnish edges with graham cracker crumbs if desired.

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Hi! I’m Shelly and I’m an addict. Of the buttercream sort. I started this site a few years ago as a way to justify my sugary, buttery obsession with desserts. It has worked out well for me so far, because as it turns out you guys all love sugary, buttery desserts too! It feels good to know you're not alone, doesn’t it?

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My filling istoo runny. I added another cup of powdered sugar. It’s still runny so I’ve stuck it in the refrigerator to see if it will thicken a bit.


I was wondering if this recipe uses the old 18.25 oz or the new smaller 15.25 oz size box of cake mix. I have other recipes that use cake mix as the base and I had to purchase another box and add about 1/2 cup to make up the difference. Gotta love the cake mix companies and the smaller boxes!


About how many does pies does one recipe make? I’ve been dying to make these for ages!


My whoopie pies are not rising like yours. They are spreading out and becoming thin. I tried adding more flour but that doesn’t seem to work. Any suggestions?


EXACTLY! I am a seasoned baker And normally make up my own recipes , but I was called to do a Keylime Whoopie pie with a graham cracker Cake type cookie and did not have time to experiment and make up my own recipe. So I went googling and found this recipe and saw the picture and thought that is great that’s perfect that’s what I’m looking for. However like you when I looked into my oven while my ‘pies’ were baking they look like pancakes. Absolutely nothing like the pictures pictured here on this recipe. Needless to say my… Read more »


How do you store these? (If any are left!)


Hmm… in the middle of making them and I’m wondering why my mixture looks so thick! It’s definitely not spoonable. It must need more water, since we’re adding more dry ingredients? Thanks! It smells really good though 🙂

ashley - Baker by Nature

I feel like I say this every time I come here… but here it goes again – I must make these and you’re brilliant!!!


Okay…waiting for the s’mores version of this! Love the idea of graham cracker in the cake mix…until then, I will have to try this nice change in desserts.


My Mother would (and instruct the baby-sitter to do so in the summer) totally lock us outside. Ever so often she would feel sorry for us and put some Kool-Aid on the porch. Good times. And these look amazing!!


Made these and it might be illegal how yummy they are! You definitely need a pastry bag to make these easily (I used a sandwich bag with an edge cut off. Things got a little messy, but it all came out great in the end!).

Nikki @Seeded at the Table

You and Kristan and your key lime brilliance! or brilliances? nope, the red dotted underline spelling corrector thingy is saying just “brilliance”. Anyway, brilliant! 😉

Renee @ Awesome on $20

I’m imagining the tartness going on in these, and I’m loving it. I can’t wait to try them.

Sommer @ ASpicyPerspective

That freshly grated lime zest totally does it for me! These look amazing, Shelly!


These look fantastic. So funny too because I was looking in a cookbook and saw a recipe for Key Lime Whoopie Pies, but these look better and way easier, and I’m all for that 🙂

Mary Kay

Wow Shelly, I LOVE Key Lime Pie and this looks amazing. I was just thinking about making s’more pancakes for the kids and thinking to myself, mixing in graham cracker crumbs should do the trick, thanks for confirming that for me!

Shelly Hi! I’m Shelly and I’m an addict. Of the buttercream sort. I started this site a few years ago as a way to justify my sugary, buttery obsession with desserts. It has worked out well for me so far, because as it turns out you guys all love sugary, buttery desserts too! It feels good to know you're not alone, doesn’t it?

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