This is the best Key lime pie recipe for a classic, perfectly tart dessert: a buttery graham cracker crust filled with creamy sweetened condensed milk custard, four egg yolks, fresh Key lime juice, and fragrant lime zest. The crust bakes for 8–10 minutes, the filling bakes for 15–18 minutes, and the finished pie needs at least 3 hours of chilling before serving.
Every bite balances bright citrus tang with gentle sweetness and a rich, silky texture. Add a cloud of lightly sweetened whipped cream for a polished finish, or serve the pie plain to let the floral Key lime flavor take center stage.
Why You’ll Love This Recipe
This pie has everything a memorable citrus dessert should offer: a crisp, buttery crust, a creamy custard center, and a clean lime finish that keeps each bite refreshing. Sweetened condensed milk supplies sweetness and body, while the egg yolks help the filling set into a smooth, sliceable custard.
The recipe is also wonderfully manageable. There is no stovetop custard to fuss over, and the crust and filling use simple ingredients that are easy to find.
For another dessert with a crisp base and comforting filling, you can also browse these pecan pie bars when planning a dessert tray.
Ingredients You’ll Need
Use a standard 9-inch pie plate and finely ground crumbs so the crust presses together evenly. About 10–12 full graham crackers will yield the 1 1/2 cups of crumbs needed.
- For the crust: 1 1/2 cups finely ground graham cracker crumbs, 1/3 cup granulated sugar, 6 tablespoons melted unsalted butter, and 1/4 teaspoon fine salt.
- For the filling: one 14-ounce can sweetened condensed milk, 4 large egg yolks, 1/2 cup Key lime juice, and 1 tablespoon finely grated Key lime zest.
- For the optional topping: 1 cup cold heavy whipping cream, 2 tablespoons confectioners’ sugar, 1/2 teaspoon vanilla extract, plus extra zest or thin lime slices.
Fresh Key limes provide the most distinctive floral flavor, but bottled Key lime juice works well when fresh fruit is unavailable. If you prefer a milder lime note, use 2 teaspoons of zest instead of the full tablespoon.
How to Make It Step-by-Step
Step 1: Heat the oven to 350°F (175°C), then prepare your pie plate. In a medium bowl, stir together the graham cracker crumbs, granulated sugar, salt, and melted butter until every crumb looks lightly moistened.
Step 2: Transfer the crumb mixture to a 9-inch pie plate and press it firmly across the bottom and up the sides. Use the flat bottom of a measuring cup to compact the base, since a firmly pressed crust will be less crumbly when sliced.
Step 3: Bake the crust for 8–10 minutes, just until it smells toasted and looks slightly darker at the edges. Remove it from the oven and let it cool briefly while you mix the filling.
Step 4: Place the egg yolks in a clean bowl and whisk until smooth. Add the sweetened condensed milk, Key lime juice, and finely grated zest, whisking only until the mixture is fully combined; excessive whipping incorporates air that can make the filling puff or crack.
Step 5: Pour the lime custard into the prepared crust and gently smooth the surface if needed. Return the pie to the 350°F oven and bake for 15–18 minutes, watching for set edges and a center that still has a slight wobble.
Step 6: Take the pie from the oven and cool it at room temperature. Once it is no longer warm, refrigerate it for at least 3 hours so the custard can firm completely; an overnight chill gives the cleanest slices.
Step 7: If using the topping, beat the cold heavy cream, confectioners’ sugar, and vanilla until soft or medium peaks form. Spread or pipe the cream over the chilled pie, then add lime zest or thin lime slices just before serving.
Chef’s Tips for a Perfect Pie
Press the crust firmly. Loose crumbs are the most common reason a graham cracker crust falls apart. Compact the mixture evenly into the corners and sides, then pre-bake it before adding the custard.
Protect the custard from overbaking. The center should move slightly when the pie is gently nudged, while the edges should look set. A completely firm center in the oven is a warning sign that the finished filling may become dense or rubbery after cooling.
Whisk with restraint. The filling does not need volume, so mix it until smooth and unified rather than frothy. This small detail helps prevent air pockets and surface cracks.
Give it enough time. Three hours is the minimum chilling time, not a suggestion to skip. If your schedule allows, prepare the pie the day before and refrigerate it overnight.
Choose the right lime. Key lime juice has a more floral, distinctively tart character than ordinary Persian lime juice. Bottled Key lime juice is convenient and practical, but avoid using regular lime juice alone if you want the traditional flavor.
Whipped Cream and Garnish Ideas
Traditional Key lime pie is often served without a topping, and that presentation lets the tart filling shine. A little whipped cream, however, adds a cool, airy contrast to the dense custard and softens the sharpest citrus notes.
Beat the cream with confectioners’ sugar and vanilla until soft or medium peaks form. Stop as soon as the cream holds its shape, since overbeating can make it grainy.
For a simple finish, spoon small clouds of cream around the edge and scatter finely grated zest over the center. Thin lime slices placed on individual portions add color, but pat them dry first so excess juice does not run onto the cream.
If you are collecting citrus-inspired dinner ideas before dessert, this cilantro lime chicken makes a bright savory companion for a relaxed meal.
Storage, Slicing, and Serving
Keep the finished pie covered in the refrigerator until you are ready to serve it. It should remain thoroughly chilled, especially when topped with whipped cream.
For neat slices, use a sharp knife and wipe the blade between cuts. Let the knife glide through the crust rather than pressing down hard, which helps preserve the delicate filling and clean edges.
- Chill the pie for at least 3 hours before cutting.
- Chill overnight when you want especially firm, tidy slices.
- Add whipped cream and fresh garnish close to serving time.
- Store leftovers covered in the refrigerator.
For a playful alternative to this classic citrus dessert, keep our root beer float pie in mind for a future gathering.
More Pie Inspiration
This recipe belongs on the dessert table, but pie can also be the centerpiece of a full menu. If you are browsing a broader collection, our guide to classic Key lime pie offers another useful stop for citrus dessert inspiration.
For a savory option on another day, try this lentil shepherd’s pie. Its hearty lentil filling is a cozy contrast to the cool, bright dessert served after it.
🍳 Best Key Lime Pie Recipe
A classic baked Key lime pie with a crisp graham cracker crust and creamy, tart lime custard. Lightly sweetened whipped cream makes an optional finishing touch.
20-25 mins
25 mins
4 hours
8 servings
Not calculated
📋 Ingredients
Graham Cracker Crust
- 1 1/2 cups Finely ground graham cracker crumbs
- 1/3 cup Granulated sugar
- 6 tablespoons Unsalted butter, melted
- 1/4 teaspoon Fine salt
Key Lime Filling
- 1 14-ounce can Sweetened condensed milk
- 4 Large egg yolks
- 1/2 cup Key lime juice, preferably fresh
- 1 tablespoon Finely grated Key lime zest
Optional Whipped Cream
- 1 cup Cold heavy whipping cream
- 2 tablespoons Confectioners’ sugar
- 1/2 teaspoon Vanilla extract
Garnish
- As needed Additional lime zest or thin lime slices
👩🍳 Instructions
- Heat the oven to 350°F (175°C). Combine the graham cracker crumbs, sugar, melted butter, and salt, then press the mixture firmly into the bottom and sides of a 9-inch pie plate.
- Bake the crust for 8–10 minutes, then let it cool briefly. Whisk the egg yolks until smooth, add the condensed milk, Key lime juice, and zest, and mix just until combined.
- Pour the filling into the warm or cooled crust. Bake for 15–18 minutes, until the edges are set and the center still has a slight wobble.
- Cool the pie at room temperature, then refrigerate it for at least 3 hours. For the cleanest slices and firmest texture, chill it overnight.
- For the optional topping, beat the cold heavy cream with confectioners’ sugar and vanilla until soft or medium peaks form. Spoon or pipe it over the chilled pie and garnish with lime zest or thin lime slices.
💡 Recipe Notes & Tips:
Fresh Key lime juice gives the most authentic floral, tart flavor, but bottled Key lime juice is a practical substitute. Avoid overbaking the filling, and do not whip the custard excessively because too much air can cause puffing and cracks.
Final Thoughts
This baked Key lime pie is a reliable recipe for anyone who loves a dessert that is creamy, bright, and unmistakably tart. The pre-baked graham cracker crust adds a toasted buttery foundation, while the condensed milk and egg yolk filling sets into a smooth custard without complicated pastry work.
Use fresh Key lime juice when possible, bake only until the center gently wobbles, and do not rush the chilling step. Once topped with softly whipped cream and a little zest, this 9-inch pie makes eight beautiful servings and is ready to bring a refreshing finish to any meal.