Key Lime Pie Bars

A wave of tangy sweetness hits your palate as you take a bite of these luscious Key Lime Pie Bars. This delightful treat combines a crunchy graham cracker crust with a creamy, zesty filling and fluffy whipped cream. In just about an hour, you can whip up this dessert that is loved for its refreshing balance of flavors and textures.

This recipe is perfect for anyone who appreciates a citrusy dessert that brightens up any occasion. Serve it at summer gatherings, family barbecues, or simply enjoy it to satisfy your sweet tooth. Plus, these bars can be made a day ahead and stored in the refrigerator—just give them a little extra time to set.

Why You’ll Love This Recipe

• The buttery graham cracker crust adds a satisfying crunch.
• A blend of key lime juice and zest delivers a refreshing citrus flavor.
• The creamy filling contrasts perfectly with the light whipped cream topping.
• This dessert is easy to transport for gatherings.

What You’ll Need

Gather these ingredients to create your delicious bars.

For the Crust

• 1 1/2 cups graham cracker crumbs (about 10 to 12 full sheets)
• 1/4 cup light brown sugar
• 6 tablespoons unsalted butter, melted
• 1 pinch kosher salt

For the Filling

• 4 large egg yolks
• 1 tablespoon key lime zest, finely grated, plus more for garnish
• 14 ounces sweetened condensed milk (1 can)
• 1/2 cup fresh key lime juice (from about 15 to 20 key limes or 3 to 4 Persian limes)
• 1 pinch kosher salt

For the Topping

• 1 cup heavy whipping cream, chilled
• 2 tablespoons confectioners’ sugar
• 1/2 teaspoon vanilla extract
• Thin lime slices and extra zest for garnish

Use Persian limes for a milder flavor.

Substitutions & Swaps

• Graham cracker crumbs: crushed cookies
• Sweetened condensed milk: evaporated milk + sugar
• Heavy whipping cream: non-dairy substitute if desired
• Lime zest: lemon zest for a different twist

How to Make It

Follow these steps to create your Key Lime Pie Bars.

Press and Pre-Bake the Crust

Preheat your oven to 350°F (175°C). In a bowl, combine graham cracker crumbs, light brown sugar, melted butter, and kosher salt. Mix well until crumbly, then press the mixture firmly into the bottom of a greased 9×9 inch baking dish. Bake for 10 minutes, then remove from the oven and set aside.

Whisk the Filling

In another bowl, whisk together the egg yolks, key lime zest, sweetened condensed milk, fresh key lime juice, and a pinch of kosher salt until smooth and thoroughly combined.

Bake the Bars

Pour the filling over the pre-baked crust and spread it evenly. Bake in the oven for 15 minutes, just until set around the edges. Allow the bars to cool at room temperature before chilling them in the refrigerator for at least 3 hours.

Chill Completely

Ensure the bars are completely chilled in the refrigerator to help them firm up for easier slicing.

Top and Slice

Once chilled, prepare the whipped topping by beating the heavy whipping cream with confectioners’ sugar and vanilla extract until stiff peaks form. Spread or pipe the whipped cream on top of the bars. Garnish with thin lime slices and additional zest for a beautiful presentation. Slice into squares and serve.

How to Store It

Fridge: up to 3 days in an airtight container.
Freezer: yes, bars can be frozen for longer storage.
Reheat: not necessary, serve chilled.

Tips for Best Results

• Ensure eggs are at room temperature for easier mixing.
• Use fresh key limes for the best flavor and zest.
• Allow the bars to fully chill to achieve firmer slices.
• Garnish just before serving for the freshest look.

Serving Suggestions

• Pair with a refreshing iced tea on a hot day.
• Serve at potlucks for a delightful dessert option.
• Enjoy after a seafood dinner for a perfect citrus finish.