If you love key lime pie but don’t feel like fussing with a pastry crust, these key lime pie bars are about to become your new favorite dessert.
They have everything that makes key lime pie so irresistible: a buttery graham cracker crust, a creamy tangy lime filling, and that perfect sweet and sour balance in every bite.
This key lime pie bars recipe comes together with just a handful of ingredients and bakes in one pan, which means less cleanup and more time enjoying dessert.
| Quick Recipe Summary | |
|---|---|
| Prep Time | 15 minutes |
| Cook Time | 25 minutes |
| Total Time | 3 hours 40 minutes (includes chilling) |
| Servings | 16 bars |
| Difficulty Level | Easy |
These bars are basically key lime pie’s easier, more shareable cousin.
If you are a citrus dessert fan, my Lemon Bars are another one worth bookmarking for your next get together.
Why You’ll Love This Key Lime Pie Bars Recipe
These bars take all the flavor of a classic key lime pie and make it so much easier to pull off.
No rolling out pie dough, no worrying about a soggy bottom crust, just a simple press in crust and a filling you whisk together in one bowl.
- Only a handful of pantry staples plus fresh limes
- One pan means quick prep and easy cleanup
- Sliceable and portable, perfect for potlucks and parties
- Sweet, tangy, and creamy in every single bite
- Make ahead friendly since they need to chill anyway
You might also enjoy: Sugar Free Key Lime Pie
Ingredients
You only need a few simple ingredients to pull off that classic key lime pie flavor in bar form, and this graham cracker crust base is the same one I use for my Graham Cracker Crust recipe.
Here is everything you will need for the crust and the filling.
- 1 ½ cups graham cracker crumbs
- ¼ cup granulated sugar
- 6 tablespoons unsalted butter, melted
- 4 large egg yolks
- 2 (14 ounce) cans sweetened condensed milk
- 1 tablespoon lime zest
- ¾ cup fresh key lime juice (or regular lime juice)
- 1 teaspoon vanilla extract
- Whipped cream, for topping
- Extra lime zest or lime slices, for garnish
Kitchen Equipment Needed
Nothing fancy required here, just a few basics that make the process smoother from start to finish.
- 9×9 inch baking pan
- Parchment paper
- Mixing bowls
- Hand mixer
- Citrus zester
- Citrus juicer
- Rubber spatula
- Cooling rack
Read Also: Pecan Pie Bars Recipe
Recommended Products for This Recipe
These are a few products I personally use and recommend to make this recipe turn out perfectly every time, and the same tools come in handy whenever I make Lemon Bar Cookies as well.
1. Microplane Zester
A sharp, fine zester makes all the difference when you need a tablespoon of lime zest without any bitter white pith.
It gives you fluffy, fragrant zest in seconds instead of fighting with a box grater.
2. Glass Citrus Juicer
Squeezing enough juice from key limes by hand can take forever since they are so small.
A good citrus juicer gets every last drop out with far less effort and mess.
3. USA Pan Square Baking Pan
An even baking pan with straight sides gives you clean, uniform bars instead of a lopsided crust.
I have used mine for years and it still bakes evenly every single time.
4. Bottled Key Lime Juice
Fresh key limes are tiny and can be hard to find outside of Florida, so keeping a bottle of real key lime juice on hand is a lifesaver.
It delivers that authentic tart flavor without hours of squeezing.
5. Offset Spatula
An offset spatula helps you spread the filling into an even layer over the crust so it bakes uniformly.
It is a small tool that makes a noticeably neater final product.
Step-by-Step Instructions: How to Make Key Lime Pie Bars
1. Prep the Pan and Oven
- Preheat your oven to 350 degrees Fahrenheit.
- Line a 9×9 inch baking pan with parchment paper, leaving some overhang on the sides so you can lift the bars out later.
- Lightly coat the parchment with nonstick cooking spray.
2. Make the Graham Cracker Crust
- In a medium mixing bowl, combine the graham cracker crumbs and granulated sugar.
- Pour in the melted butter and stir until the mixture looks like wet sand and every crumb is coated.
- Pour the mixture into the prepared pan and press it firmly and evenly into the bottom using the back of a measuring cup.
- Bake the crust for 10 minutes, then remove it from the oven and let it cool slightly while you make the filling.
3. Whisk the Egg Yolks
- In a large mixing bowl, beat the egg yolks with a hand mixer for 2 to 3 minutes, until they turn pale yellow and slightly thickened.
- This step helps the filling set up smoothly once it bakes.
4. Add the Condensed Milk, Zest, and Juice
- Pour the sweetened condensed milk into the egg yolks and mix on low speed until fully combined.
- Add the lime zest, lime juice, and vanilla extract.
- Mix just until the filling is smooth and slightly thickened, being careful not to overmix.
5. Fill and Bake
- Pour the lime filling over the warm crust and spread it into an even layer with a rubber spatula or offset spatula.
- Bake for 15 to 18 minutes, until the edges look set and the center still has a slight jiggle.
- Avoid overbaking, since the filling will continue to set as it cools.
6. Cool and Chill
- Let the bars cool at room temperature for about 30 minutes.
- Transfer the pan to the refrigerator and chill for at least 3 hours, or until fully set. Overnight is even better.
7. Slice and Serve
- Once chilled, use the parchment overhang to lift the whole slab out of the pan.
- Slice into 16 even squares using a sharp knife, wiping the blade clean between cuts for neat edges.
- Top each bar with a swirl of whipped cream and a little extra lime zest right before serving.
Another favorite: Strawberry Crepes with Whipped Cream
Tips for The Best Key Lime Pie Bars
A few small details make a big difference between good key lime pie bars and truly great ones, and the same lessons apply when I make my Lemon Meringue Pie.
- Use room temperature eggs so the filling blends smoothly
- Do not skip pressing the crust firmly, or it will crumble when sliced
- Chill the bars fully before cutting for clean, sharp edges
- Zest your limes before juicing them, it is much easier that way
- A hot knife wiped clean between cuts gives the neatest squares
Serving Suggestions
These bars are refreshing enough to serve on their own, but a few extras take them to the next level.
- A dollop of fresh whipped cream and a curl of lime zest
- A scoop of vanilla ice cream alongside for a warm weather treat
- Alongside other bite sized treats on a summer dessert table
- A light dusting of powdered sugar for a simple, elegant finish
Read Also: No Bake Peach Tart Recipe
Variations of Key Lime Pie Bars
Once you have the basic recipe down, it is easy to switch things up depending on what you are craving.
- Coconut Key Lime Bars: Fold toasted shredded coconut into the crust for a tropical twist.
- Graham Nut Crust: Add finely chopped pecans or macadamia nuts to the crust for extra crunch.
- Lighter Version: Use light or fat free sweetened condensed milk to cut down on richness.
- Mini Bars: Bake in a mini muffin tin lined with paper liners for individual bite sized portions.
If you enjoy playing with different versions of the same classic dessert, my Mini Key Lime Pies are another fun way to switch up the presentation.
Storage and Reheating
Because of the creamy filling, these bars need to stay cold until you are ready to serve them.
- Store covered in the refrigerator for up to 5 days
- Freeze unsliced or sliced bars for up to 2 months, wrapped tightly in plastic wrap and foil
- Thaw frozen bars overnight in the refrigerator before serving
- Add whipped cream topping fresh, right before serving rather than before storing
Another favorite: Peach Crumb Bars, which store just as easily for make ahead desserts.
Nutritional Facts
Nutritional values are approximate and will vary depending on exact ingredients and portion sizes used.
- Calories: 240 per bar
- Carbohydrates: 34g
- Protein: 4g
- Fat: 10g
- Saturated Fat: 6g
- Sugar: 27g
- Sodium: 140mg
For another naturally portioned dessert, take a look at my Coconut Macaroons.
Health Benefits of Key Ingredients
While this is definitely a treat, a few of the ingredients do offer some nice nutritional perks.
- Lime juice: A good source of vitamin C, which supports immune health
- Egg yolks: Provide protein along with vitamins A, D, and B12
- Graham crackers: Offer a bit of whole grain fiber compared to some other crust options
- Lime zest: Contains antioxidant compounds along with its bright citrus flavor
Read Also: No Bake Greek Yogurt Fruit Tart
FAQs About Key Lime Pie Bars
1. Can I use regular limes instead of key limes?
Yes, regular limes work perfectly well in this recipe if key limes are not available.
The flavor will be slightly less tart and floral, but still bright and delicious.
2. Why is my filling runny after baking?
This usually means the bars were underbaked or not chilled long enough before slicing.
Make sure to chill the bars for at least 3 hours, or ideally overnight, so the filling fully sets.
3. Can I make these bars ahead of time?
Absolutely, these bars are actually best made a day ahead since they need time to chill anyway.
Just add the whipped cream topping right before serving.
4. Do I have to use a graham cracker crust?
Graham cracker crust is the classic choice, but a shortbread or vanilla wafer crust works too.
Check out my Keto Key Lime Pie for an idea using a lower carb crust option.
5. Can I freeze key lime pie bars?
Yes, these bars freeze beautifully for up to 2 months when wrapped tightly.
Just thaw them in the refrigerator overnight before adding fresh whipped cream and serving.
Key Lime Pie Bars
Ingredients
- 1 ½ cups graham cracker crumbs
- ¼ cup granulated sugar
- 6 tablespoons unsalted butter melted
- 4 large egg yolks room temperature
- 2 sweetened condensed milk 14 ounce cans
- 1 tablespoon lime zest from about 2-3 limes
- ¾ cup fresh key lime juice or regular lime juice, about 12-15 key limes
- 1 teaspoon vanilla extract
- whipped cream for topping, homemade or store-bought
- lime zest extra, for garnish
- lime slices for garnish (optional)
Equipment
- 9×9 inch baking pan
- Parchment paper
- Mixing bowls
- Hand mixer
- Citrus zester
- Citrus juicer
- Rubber spatula
- Cooling rack
- Measuring cup for pressing the crust
- Offset spatula
- Sharp knife for slicing clean bars
Method
- Preheat oven to 350°F. Line a 9×9 inch baking pan with parchment paper, leaving overhang on the sides for easy removal. Lightly coat with nonstick spray.
- In a medium bowl, combine graham cracker crumbs and sugar. Add melted butter and stir until the mixture resembles wet sand. Press firmly into the prepared pan using a measuring cup. Bake for 10 minutes, then cool slightly.
- In a large bowl, beat the egg yolks with a hand mixer for 2-3 minutes until pale yellow and slightly thickened.
- Add the sweetened condensed milk, lime zest, lime juice, and vanilla extract. Mix on low speed until smooth and just combined. Be careful not to overmix.
- Pour the lime filling over the warm crust and spread evenly with a rubber or offset spatula. Bake for 15-18 minutes until edges are set and the center has a slight jiggle. Avoid overbaking.
- Cool at room temperature for 30 minutes, then refrigerate for at least 3 hours or overnight until fully set.
- Use the parchment overhang to lift the slab from the pan. Slice into 16 squares with a sharp knife, wiping the blade clean between cuts. Top with whipped cream and extra lime zest before serving.
Nutrition
Notes
- Use room temperature eggs for a smoother filling that blends easily.
- Press the crust firmly into the pan so it holds together when sliced.
- Chill the bars completely before cutting to get clean, sharp edges.
- Zest the limes before juicing them—it’s much easier that way.
- For neatest squares, use a hot knife and wipe it clean between cuts.
- Store covered in the refrigerator for up to 5 days.
- Freeze unsliced or sliced bars for up to 2 months wrapped tightly; thaw overnight in the fridge.
- Add whipped cream topping fresh, right before serving rather than before storing.
- Regular limes work perfectly if key limes are not available—the flavor will be slightly less tart.
- For a tropical twist, fold toasted shredded coconut or chopped pecans into the crust.
Private Notes
Tried this recipe?
Let us know how it was!Conclusion
These key lime pie bars really do give you all the best parts of a classic key lime pie without any of the fuss.
They are creamy, tangy, and just sweet enough, with a buttery crust that holds everything together perfectly.
I hope this one earns a permanent spot in your dessert rotation the way it has in mine.
If you give these a try, I would love to hear how they turned out.
Drop a comment below or share a photo, I always enjoy seeing your versions of these recipes.
Recommended:
- Gluten Free Key Lime Pie
- Vegan Key Lime Pie
- Dairy Free Key Lime Pie
- Key Lime Pie Cookies
- Coconut Cream Pie
