Key Lime Bars

Key Lime Bars are a tangy, sweet dessert featuring a smooth citrus filling on a buttery graham cracker crust. Inspired by the classic Key lime pie, these bars are cut into squares, making them ideal for sharing at picnics, parties, or after-dinner treats. Their vibrant flavor and creamy texture make them a refreshing dessert favorite.

Why You’ll Love This Recipe

Key Lime Bars strike the perfect balance between tart and sweet. They’re easy to make with minimal ingredients, can be prepared ahead of time, and offer a cooling, citrusy flavor that’s especially enjoyable in warmer months. The handheld bar format makes them simple to serve and eat—no forks required.

Ingredients

(Tip: You can find the complete list of ingredients and their measurements in the recipe card below.)

• Graham cracker crumbs
• Granulated sugar
• Butter, melted
• Sweetened condensed milk
• Egg yolks
• Key lime juice (fresh or bottled)
• Lime zest (optional for extra flavor)
• Powdered sugar (for dusting, optional)

Directions

1. Preheat the oven to 350°F (175°C). Line an 8×8-inch or 9×9-inch baking pan with parchment paper.
2. In a bowl, combine graham cracker crumbs, sugar, and melted butter until evenly moistened.
3. Press the mixture firmly into the bottom of the prepared pan to form the crust.
4. Bake the crust for 8–10 minutes, then let it cool slightly.
5. In another bowl, whisk together the sweetened condensed milk, egg yolks, and Key lime juice until smooth. Add lime zest if using.
6. Pour the filling over the cooled crust and spread evenly.
7. Bake for 15–18 minutes, or until the filling is just set but still slightly jiggly in the center.
8. Cool to room temperature, then refrigerate for at least 3 hours before slicing.
9. Dust with powdered sugar before serving, if desired.

Servings and timing

Servings: 9 to 12 bars
Prep Time: 15 minutes
Cook Time: 25 minutes
Chill Time: 3 hours
Total Time: 3 hours 40 minutes

Variations

• Coconut Crust: Add shredded coconut to the crust for tropical flair.
• Gluten-Free: Use gluten-free graham crackers for a gluten-free version.
• Lemon Bars: Substitute Key lime juice with lemon juice for a lemony variation.
• Topping Option: Serve with a dollop of whipped cream or a thin layer of meringue.

Storage/Reheating

Store Key Lime Bars in an airtight container in the refrigerator for up to 4 days. These bars should not be frozen as the texture of the filling can change upon thawing. Serve chilled. Reheating is not recommended.

FAQs

Can I use regular limes instead of Key limes?

Yes, if Key limes are unavailable, Persian limes (regular limes) can be substituted.

Do I have to use fresh juice?

Freshly squeezed juice is best, but bottled Key lime juice works well in this recipe.

How do I know when they are done baking?

The filling should be set at the edges and slightly jiggly in the center. It will firm up as it chills.

Can I make these ahead of time?

Yes, Key Lime Bars are ideal for making a day in advance. They need chilling time to set properly.

Can I double the recipe?

Yes, use a 9×13-inch pan and adjust baking times slightly as needed.

How do I get clean cuts?

Use a sharp knife dipped in warm water and wiped clean between cuts for neat slices.

Are these bars very tart?

They have a bright citrus flavor, but the sweetness of the condensed milk balances the tartness.

Can I add a topping?

Yes, whipped cream, lime zest, or a light dusting of powdered sugar work beautifully.

Is there a dairy-free option?

You can try coconut condensed milk, but results may vary in texture and flavor.

Can I freeze them?

Freezing is not recommended, as it can cause the filling to become grainy upon thawing.

Conclusion

Key Lime Bars offer a refreshing burst of citrus in a creamy, portable dessert square. Their smooth texture and tangy flavor make them a crowd-pleasing treat that’s easy to prepare and perfect for any occasion. Whether you’re hosting a summer party or simply craving something sweet and zesty, these bars are sure to satisfy.

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