Key Lime Pie Dip

This 3-ingredient Key Lime Pie Dip recipe is the easiest way to enjoy the tasty flavors of key lime pie! This quick and easy dessert dip is the perfect fat-free treat for summer!

Easy Key Lime Pie Dip Recipe

So remember back in the 90’s when “fat free” was a thing?

I was all over that.

Because I could “diet” while eating handfuls of gummy worms, Sweet Tarts and Fun Dip.  It was basically the best diet fad ever.

And then those Fat Free Snackwell’s cookies came out and completely ruled my college years.

Ahhh, the 90’s were a good time.

I may or may not have eaten those cookies by the boxful.

They’re fattttt freeeeee we would tell ourselves sitting on the floor of our 9×11 college dorm room.  Because everyone knows that if something is “fat free” you can eat an infinity amount and it doesn’t count.  It was glorious.


Until my jeans didn’t fit.

I had to quit the fat-free.  It was making me fat-expensive.


But here’s the thing.

I made this dip.

Actually by accident…I was trying to make something entirely different, and before I knew it, I had licked the whole bowl clean, deeming this “dip”, due to the number of belly flops my finger did into the bowl.

“Dip” is a nicer name than “a bowl of stuff that you ate with your finger because you couldn’t wait to for it to fully ‘set up’,  because you’re a  fatty” dessert.

And then “for research” I made the dip again…and I made it fat free, because I was feeling Snackwell’s-nostalgic.

Which is actually a condition.

Look it up.


ps ~ having tasted both the full-fat and fat-free versions of this dip, make the fat free, they taste the same…save your fat for a Reese’s Cup.


Fat-Free Key Lime Pie Dip.

Image of Key Lime Pie Dip with Graham Crackers

This is basically the easiest dessert ever.

How to Make Key Lime Pie Dip

All it takes is 3 ingredients, a bowl, a whisk and you’re done.

Mix some Key Lime Juice and sweetened condensed milk together…


Image of Key Lime Juice being Added to the Bowl for Key Lime Pie Dip

The acidic fruit juice combined with the SCM thickens the mixture without heating…it’s all sciency and stuff…

Image of Mixing Ingredients in the Bowl for Key Lime Pie Dip

The for added measure I plopped in some Marshmallow Fluff.  Just for a little something extra.

Image of Fluff Mixing into the Bowl for Key Lime Pie Dip

I let it chill for a bit and then dove in.  Literally.

Image of Key Lime Pie Dip with a Graham Cracker


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Image of A Graham Cracker Dipped in Key Lime Pie Dip

Key Lime Pie Dip

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  • Author: Shelly
  • Prep Time: 5 minutes
  • Cook Time: 0 minutes
  • Total Time: 1 hour 5 minutes
  • Yield: 4 servings 1x
  • Category: Dessert
  • Method: No Bake
  • Cuisine: American


This 3-ingredient Key Lime Pie Dip recipe is the easiest way to enjoy the tasty flavors of key lime pie! This quick and easy dessert dip is the perfect fat-free treat for summer!


  • 1 (14 oz) can fat free sweetened condensed milk
  • 1/4 cup + 2 Tbsp Key Lime Juice
  • 1/2 cup Marshmallow Fluff
  • graham crackers/fruit to dip


  1. In a medium bowl whisk together the sweetened condensed milk and key lime juice until thickened, approx 30 seconds.
  2. Add in the Fluff and continue stirring until incorporated.
  3. Chill for at least an hour.
  4. Serve chilled with graham crackers and/or fruit


full fat sweetened condensed milk can be used in place of fat free.

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Image of Key Lime Pie Dip with a Graham Cracker

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54 comments on “Key Lime Pie Dip”

  1. OMG OMG I was obsessed with Snackwell’s. True story, my friend sent me a video of me in high school offering some candy to my yearbook teacher & saying it’s fat free! hahaha

    this key lime pie dip looks amazing!

  2. Um yum! And if you add a splash (or 5) of tequila it could be a margarita dip!

    You know what I remember? When bagels were diet food. Good times….. A big ol’ fluffy bagel with some light cream cheese – nothing like a gazillion white flour carbs to start your day!

  3. Averie @ Averie Cooks

    The fat free & fat expensive – lol’ing b/c all that fatfree stuff was so expensive!

    Great dip!

  4. Kim of Mo'Betta

    Girlll, I still have the ‘it’s fat free so stuff your face’ mentality. It’s definitely a mental illness. And I’m still fat, so obviously it doesn’t work like that. *sigh* I know this ‘dip’ is fabulous b/c this is how my mom always made Lemon Pie….with lemon juice instead of lime and minus the fluff, and she put meringue on top (which makes it something totally different) but my point is sweetened condensed milk plus lemon or lime juice is fantastic!

  5. I’m pretty sure that sounds like my dream dip. Key lime is my favorite, dip is my favorite, and I’m in love.

  6. I make something similar from the Key Lime mix from Tastefully Simply, so I’m grateful for a recipe I can make on my own! Thanks!

  7. Ashton @ Something Swanky

    You know what’s awful?? Those snackwell’s cookies STILL get me! I still walk by them and think, “oh, yeah, those are fat free! Why don’t I ever buy these??” And then I have to re-read the nutrition label every time to remember. 😛

    LOVE this! I’m so all about sweet dips, and this looks amazingly perfect.

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