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    Home ยป Recipes ยป Bars & Brownies

    Key Lime Pie Bars

    August 1, 2021 By Sam 46 Comments

    This post may contain affiliate links. As an Amazon Associate I earn from qualifying purchases. Please read my disclosure policy.
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    collage of key lime pie bars, top image is of close up single bar, bottom image of bar on white plate

    Key Lime Pie Bars are a little sweet, very tart, and smooth and creamy over a crumbly golden (homemade) graham cracker crust. They’re also incidentally egg-free! Can you believe these take only minutes to prep and bake? Recipe includes a how-to video!

    square of creamy key lime pie bar on marble, topped with whipped cream and lime zest

    Rich, creamy, and only slightly sweetened, these key lime pie bars are perfectly tart, enough to make your mouth pucker just thinking about them. Fans of my lemon bars will love these tart treats (and perhaps even more they’ll love how easy these bars are to make in comparison).

    Served on a crumbly, perfectly sweetened graham cracker crust, today’s recipe is obviously inspired by my key lime pie, but look closely at the ingredients (which I highlight below) and you’ll see that there are some noteworthy differences.

    What You Need

    Ingredients for Key Lime Pie Bars
    • Sweetened Condensed Milk. This is the base of our pie filling and serves as our sweetener. Do not substitute evaporated milk (this seems to be a common mistake, please note they are not the same thing and your bars will not only taste right but they won’t set properly if you use evaporated milk).
    • Sour cream. To make this recipe easy (and, incidentally, egg free), I ultimately ended up swapping out the the 6 egg yolks that I used in my pie recipe with sour cream (I can’t help wanting to change things up from recipe to recipe!). The results are rich and creamy and a bit more tart/sour than my classic pie, but every bit as good!
    • Key limes. Key limes are tiny (ping-pong-ball-sized) limes that may be either green or yellow (or a spotty combo of the two colors) that have a flavor that’s distinct from their more common grocery store counterparts (which are typically Persian limes). While I recommend using fresh key limes if you can find them, unfortunately I have always had a lot of trouble finding these in any grocery stores within 20 miles of me. If you can’t find key limes, don’t use “regular” limes, instead find yourself a bottle of key lime juice! Nellie & Joe’s brand is what I use, it’s typically sold near the lemon juice and I included a photo above.

    SAM’S TIP: Here’s a hand-saving tip if you’re able to find fresh key limes: Use a garlic press!. Halve your limes, place them in the press (rind-side up) and then squeeze the juices into a measuring cup. So much easier than hand-squeezing!

    Then of course you’ll also need graham cracker crumbs, sugar, and butter to make your graham cracker crust. Salted or unsalted butter will work equally well in the crust. I like to use a Tablespoon of brown sugar to help enhance the flavor of the crust, but if you don’t have any you can use all granulated sugar.

    While it’s not strictly necessary, I highly recommend topping your bars with dollops of homemade whipped cream before serving. It adds a light, sweet, contrast to the otherwise tart bars!

    How to Make Key Lime Pie Bars

    Collage of 4 photos showing how to make key lime pie bars
    1. Prepare the graham cracker crust! Stir together graham cracker crumbs, sugar, and melted butter. Stir until all of the crumbs are coated with butter and the mixture is sandy and well-combined.
    2. Press crumbs into the bottom and part-way up the sides of a foil-lined 9×9″ baking pan. Press the bottom into an even layer, I like to use the back of a spoon or the clean, flat bottom of a measuring cup to do this.
    3. Whisk together the remaining ingredients (I actually recommend whisking together all of the ingredients except for the key lime juice, then whisking that in last as it’s much thinner than the other ingredients and adding it with the other ingredients can make it harder to incorporate) until the mixture is smooth.
    4. Pour key lime pie bar batter into prepared pan and use a spatula to spread the filling so you have a smooth layer.

    SAM’S TIP: Lining the pan with foil isn’t absolutely necessary, but it does make it much easier to remove the key lime pie bars from the pan after baking. Make sure you use a long enough piece of foil that it hangs over two of the sides of the pan (creating a sort of sling). After baking and completely cooling the bars, use the excess foil to carefully lift them out of the pan, then easily cut and serve on your counter.

    Frequently Asked Questions

    Can I substitute a different lime if I can’t find key limes?

    I do not recommend it, as most limes available in the grocery store are Persian limes, which have a distinctly different flavor. If you can’t find key limes, purchase key lime juice instead, which can often be found near the lemon juice.

    Are key lime pie bars supposed to be green?

    No! Green key lime pie is usually that color due to added food coloring. Key lime pie should be a creamy white/yellow color.

    Can I make this as a pie?

    I don’t see why not! If you have excess batter, simply discard it, do not overflow your pie plate. I also should note that I already have a killer key lime pie recipe on the blog and prefer that when making a pie.

    Key lime pie bars

    Enjoy!

    Let’s bake together! I’ll be walking you through all the steps in my written recipe and video below! If you try this recipe, be sure to tag me on Instagram, and you can also find me on YouTube and Facebook

    square of creamy key lime pie bar on marble, topped with whipped cream and lime zest

    Key Lime Bars

    Key Lime Pie Bars are a little sweet, very tart, and smooth and creamy over a crumbly golden (homemade) graham cracker crust. They're also incidentally egg-free! Can you believe these take only minutes to prep and bake? Be sure to check out the how-to video!
    5 from 19 votes
    Print Pin Rate
    Prevent your screen from going dark
    Course: Dessert
    Cuisine: American
    Prep Time: 15 minutes minutes
    Cook Time: 15 minutes minutes
    Total Time: 30 minutes minutes
    Servings: 16 squares
    Calories: 92kcal
    Author: Sam Merritt

    Ingredients

    Graham Cracker Crust

    • 1 ½ cups (170 g) graham cracker crumbs
    • 2 Tablespoons sugar
    • 1 Tablespoon brown sugar firmly packed
    • 6 Tablespoons (85 g) butter melted

    Key Lime Pie Bar Filling

    • 2 14 oz cans (795 g) sweetened condensed milk
    • ⅓ cup (75 g) sour cream
    • 2 teaspoons lime zest optional
    • ⅔ cup (150 ml) key lime juice
    • homemade whipped cream for topping, optional. Click the link for the recipe, you will only need ยฝ batch.

    Recommended Equipment

    • 9×9 baking pan
    • Mixing bowls

    Instructions

    Graham Cracker Crust

    • Preheat oven to 350F (175C) and line a 9×9" (23x23cm) baking pan with foil.  Set aside.
    • Combine graham cracker crumbs, sugar, and brown sugar in a large bowl.  
      1 ½ cups (170 g) graham cracker crumbs, 2 Tablespoons sugar, 1 Tablespoon brown sugar
    • Add melted butter and stir well.
      6 Tablespoons (85 g) butter
    • Press evenly and firmly into the bottom and up the sides of prepared pan.
    • Bake on 350F (175C) for 7-8 minutes.  Allow to cool slightly while you prepare your key lime filling.

    Key Lime Filling

    • In a large bowl, whisk together sweetened condensed milk, sour cream, and lime zest (if using) until mixture is smooth.
      2 14 oz cans (795 g) sweetened condensed milk, ⅓ cup (75 g) sour cream, 2 teaspoons lime zest
    • Gradually whisk in key lime juice until mixture is smooth.
      ⅔ cup (150 ml) key lime juice
    • Pour into prepared pie crust and bake for 8-10 minutes, until mixture is set if you jiggle the pan.
    • Remove from oven and allow to cool to room temperature, then transfer to refrigerator and allow to chill 4-6 hours before cutting.
    • Top with whipped cream, if desired, and serve.
      homemade whipped cream

    Notes

    Storing

    Keep refrigerated in an airtight container for up to one week.

    Nutrition

    Serving: 1squares | Calories: 92kcal | Carbohydrates: 9g | Protein: 1g | Fat: 6g | Saturated Fat: 3g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Trans Fat: 1g | Cholesterol: 14mg | Sodium: 94mg | Potassium: 35mg | Fiber: 1g | Sugar: 4g | Vitamin A: 167IU | Vitamin C: 3mg | Calcium: 15mg | Iron: 1mg

    Nutritional information is based on third-party calculations and should be considered an estimate only. Actual nutritional content will vary based upon brands used, measuring methods, cooking method, portion sizes, and more.

    Tried this recipe? Show me on Instagram!Mention @SugarSpun_Sam or tag #sugarspunrun!

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    Overhead of key lime pie bars

    This recipe was originally published June of 2017. The recipe remains the same, but I have updated the text to be more informative and have updated some of the photos and added a video.

    « How to Cook Bacon in the Oven
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    Reader Interactions

    Comments

    1. Perry

      April 14, 2025 at 6:50 pm

      5 stars
      I’ve made your Key Lime Pie and the Key Lime Bars, both are amazing and sooo good! The bars are just too easy not to put into regular rotation! And, do not, repeat not omit the jest!

      Reply
      • Emily @ Sugar Spun Run

        April 15, 2025 at 10:30 am

        We are so happy you enjoyed both recipes, Perry! Thanks for the review ๐Ÿฉท

        Reply
    2. adell

      July 02, 2024 at 7:20 pm

      5 stars
      Sooo YUMMY!!

      Reply
    3. Meg

      August 07, 2023 at 10:06 am

      5 stars
      Can these be frozen?

      Reply
      • Sam

        August 07, 2023 at 4:18 pm

        Hi Meg! That should work just fine. ๐Ÿ™‚

        Reply
    4. Gale Bean

      July 25, 2023 at 7:29 am

      5 stars
      BEST DESSERT EVER!!!! So smooth and creamy and delicious and easy to make. I have made this twice (doubled) since it was posted a few weeks ago and it has been a hit at the parties. Each time the recipe has been requested. I happily shared the recipe and encouraged my friends to check out the Sugar Spun Run website for other amazing desserts.

      Reply
      • Sam

        July 25, 2023 at 10:43 am

        Thank you so much, Gale! I’m so glad you enjoyed it so much! ๐Ÿ™‚

        Reply
    5. Kathy Hall

      May 31, 2023 at 1:50 pm

      Witch is better the key lime bars or the key lime pie ?

      Reply
      • Sam

        May 31, 2023 at 9:30 pm

        Hi Kathy! Personally I prefer the key lime pie, but you can’t really go wrong either way. ๐Ÿ™‚

        Reply
    6. Sandra Pfeil

      May 11, 2023 at 11:43 pm

      Can this be doubled and made in a 9X13 pan?

      Reply
      • Emily @ Sugar Spun Run

        May 12, 2023 at 11:05 am

        Hi Sandra! That should work fine. Enjoy!

        Reply
    7. Anna D.

      April 11, 2023 at 10:22 pm

      5 stars
      These key lime bars are creamy and smooth, with a good crunch from the graham cracker crust. Made them for Easter and everyone loved them!

      Reply
      • Sam

        April 12, 2023 at 10:58 am

        I’m so glad everyone enjoyed them so much, Anna! ๐Ÿ™‚

        Reply
    8. Kristen

      January 18, 2023 at 2:04 pm

      5 stars
      Don’t hesitate; make these! I made these for the first time for my family last summer, and we bought a similar key lime pie bar from a reputable bakery to compare. These were better by far, hands-down! I served them with Sam’s homemade whipped cream and some berries. Eyes were rolling into the back of everyone’s heads ๐Ÿ˜€

      Reply
      • Sam

        January 18, 2023 at 8:45 pm

        Love hearing this! Thank you so much for your kind words, Kristen!! ๐Ÿ™‚

        Reply
    9. Wendy

      July 10, 2022 at 7:56 pm

      These are so easy & so good. Itโ€™s my new go to recipe when I need to bring a dessert.

      Reply
    10. Laura

      June 05, 2022 at 1:39 pm

      Hi Sam!
      I love ALL your recipes! You are one talented girl! I wanted to make a suggestion or a plea ๐Ÿ˜†. There’s this restaurant called BONEFISH GRILL and they have Key lime cake it’s so good! Could you possible come up with a copycat recipe for that?

      Reply
      • Sam

        June 07, 2022 at 12:26 pm

        Thank you so much, Laura! I will have to find this restaurant and give it a try. I’ll add it to my list. ๐Ÿ˜‰

        Reply
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    5 from 19 votes (8 ratings without comment)

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    The author (Sam) in blue shirt holding donut Hi, I'm Sam! I'm dedicated to bringing you sweet, simple, and from-scratch dessert recipes. My life may or may not be controlled by my sweet tooth. Send help (or chocolate). Read more about me.

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