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This zesty key lime pie bars recipe transforms the classic dessert into convenient squares perfect for entertaining or treating yourself to a bright citrus indulgence any day of the week. The buttery graham cracker crust topped with a silky smooth, tangy lime filling delivers all the flavors of traditional key lime pie but in a hand-held format.
I first made these bars for a summer barbecue when I wanted something lighter than chocolate desserts. The bright citrus flavor was such a hit that these bars have become my signature dessert request for gatherings year round.
Ingredients
- Graham crackers: Makes the perfect sweet and slightly salty base for these bars
- Sugar: Enhances the sweetness of the graham cracker crust
- Salt: Balances the sweetness and brings out flavor
- Unsalted butter: Binds the crust together and adds richness
- Cream cheese: Creates a silky smooth texture and balances the tartness of the lime
- Sweetened condensed milk: Provides the signature sweet and creamy texture of key lime pie
- Egg yolks: Gives structure and richness to the filling
- Lime zest: Contains essential oils that provide intense lime flavor
- Key lime juice: The star ingredient gives authentic tangy flavor, use fresh when possible
- Vanilla extract: Adds depth and balances the citrus notes
Step-by-Step Instructions
- Prepare the pan:
- Preheat your oven to 350°F and line your baking pan with foil or parchment paper leaving an overhang on the sides for easy removal later. This step is crucial for clean cutting when serving.
- Make the crust:
- Crush graham crackers until they become fine crumbs either using a food processor for speed or place them in a bag and crush with a rolling pin. In a bowl combine the crumbs with sugar, salt, and melted butter until the mixture resembles wet sand. Press firmly and evenly into the bottom of your prepared pan using the flat bottom of a measuring cup works perfectly. Bake for 10 minutes until just beginning to turn golden.
- Prepare the filling:
- While the crust bakes, beat the cream cheese until completely smooth with no lumps, this usually takes about 2 minutes on medium speed. Add the sweetened condensed milk and continue mixing until fully incorporated. Add egg yolks one at a time allowing each to fully incorporate before adding the next. This gradual addition prevents the mixture from curdling. Finish by adding lime zest, juice, and vanilla extract mixing just until combined.
- Bake the bars:
- Pour the filling over the hot crust right after it comes out of the oven. Return to the oven and bake for 15 to 18 minutes until the filling is set but not browned. The center should have just a slight jiggle when you gently shake the pan. Overbaking will cause cracks so keep a close eye during the final minutes.
- Chill thoroughly:
- Allow the bars to cool completely at room temperature before transferring to the refrigerator. Chill for at least 2 hours but preferably 4 hours or overnight. The flavors develop and the texture improves with longer chilling time.
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The key lime juice is truly what makes these bars special. I discovered the difference when I made them side by side with regular lime juice and key lime juice. While both were delicious, the key lime version had that distinctive tangy flavor that transported everyone right to the Florida Keys with each bite.
Storage Tips
These key lime bars keep beautifully in the refrigerator for up to 5 days in an airtight container. For the freshest taste, place a piece of parchment between layers if stacking. The graham cracker crust will soften slightly over time but remains delicious.
For longer storage, you can freeze these bars for up to 3 months. Wrap individual pieces in plastic wrap, then place in a freezer bag. Thaw overnight in the refrigerator before serving for best texture.
Ingredient Substitutions
No key limes available? Regular Persian limes work wonderfully too. You might need to adjust the amount slightly as key limes tend to be more acidic. Start with the same amount and add more to taste if needed.
For a dairy free version, substitute the cream cheese with dairy free cream cheese and use coconut condensed milk instead of traditional sweetened condensed milk. The flavor profile will change slightly but the tropical coconut complements the lime beautifully.
Gluten free graham crackers make an excellent substitute for traditional ones in the crust. The texture and flavor remain nearly identical making this an easy adaptation for those with gluten sensitivities.
Serving Suggestions
These key lime bars are stunning when served with a dollop of fresh whipped cream and a small slice of lime as garnish. For extra visual appeal, dust the tops lightly with powdered sugar just before serving.
For a dessert table, create a citrus theme by pairing these bars with lemon cookies or orange-scented shortbread. The complementary citrus flavors create a cohesive dessert spread that feels thoughtfully curated.
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Frequently Asked Questions
- → Can I use regular limes instead of key limes?
Yes, regular lime juice can be substituted for key lime juice in equal amounts. Key limes have a more intense, slightly floral flavor, but regular limes will still produce delicious results. The recipe specifically mentions this substitution is acceptable.
- → How do I know when the bars are fully baked?
The bars are done when the filling is set but the top is not browned, typically after 15-18 minutes of baking. The center might still have a slight jiggle but should not be liquid. They'll continue to set as they cool in the refrigerator.
- → Can these bars be frozen?
Yes, these bars freeze well. Cut them into portions, place in an airtight container with parchment paper between layers, and freeze for up to 3 months. Thaw in the refrigerator overnight before serving.
- → How far in advance can I make these bars?
These bars can be made up to 3 days in advance. Store them in an airtight container in the refrigerator. The graham cracker crust will maintain its texture and the filling will stay fresh.
- → What's the best way to cut clean slices?
For clean cuts, chill the bars thoroughly (at least 4 hours or overnight), use a sharp knife, and wipe the blade clean between cuts. Running the knife under hot water before each cut can also help create smooth edges.
- → Can I add toppings to these bars?
Absolutely! These bars are delicious with a dollop of whipped cream, a sprinkle of lime zest, thin lime slices as garnish, or even a light dusting of powdered sugar. For added texture, consider a sprinkle of toasted coconut.