Classic Key Lime Pie Recipe with Creamy Graham Cracker Crust

Looking for the best key lime pie recipe? Your search ends here. This version delivers a perfectly tangy, rich, silky-smooth filling that isn’t overly sweet and is easy to make. It pairs beautifully with a buttery graham cracker crust and a light, fluffy whipped cream topping.

I grew up in Japan enjoying lemon and yuzu desserts, and the bright citrus flavors always drew me in. When I first tasted a classic key lime pie in the United States, I fell in love with its distinct lime flavor and creamy texture. This recipe has become one of my favorites alongside lemon meringue and apple pie. If you love lime, you can adapt these techniques for lime mousse, lime cheesecake, or lime madeleines.

What Makes This Key Lime Pie Exceptional

1. Easy to prepare: The filling comes together in about ten minutes using five common ingredients. No complicated techniques or tempering required.
2. Wonderful texture: The filling is creamy, light, and silky-smooth—firm enough to hold a slice but not dense or heavy.
3. Balanced sweetness: Sweetened condensed milk provides sweetness without overpowering the lime. The pie highlights fresh lime flavor rather than cloying sugar.
4. Made with fresh lime: Using freshly squeezed lime juice and a touch of lime zest gives bright citrus aroma and flavor that bottled juice can’t match.

VIDEO: Watch How To Make the Key Lime Pie!

There is a step-by-step video tutorial available that demonstrates each stage of the recipe, from making the crust to finishing the whipped cream topping. Watching the process can make the techniques easier to follow.

Tips for the Key Lime Pie Ingredients

The Pie Crust

• Graham crackers: Any graham-style crackers work—finely crushed for a firm base, with a few larger crumbs left for texture.
• Granulated sugar: A small amount in the crust improves texture and balances the citrus.
• Lime zest: Zest only the colored part of the peel; the white pith is bitter.
• Unsalted butter: Melted butter binds the crumbs into a flavorful, golden crust.

The Filling

• Egg yolks: Provide richness and help the filling set to a silky consistency.
• Sour cream: Adds a refreshing tang that complements the lime; Greek yogurt can be substituted if desired, with a slightly different flavor.
• Lime zest: Important for aromatic depth—don’t skip it.
• Sweetened condensed milk: Use sweetened condensed milk, since no other sugar is added to the filling.
• Heavy cream: Lightens the texture while adding richness.
• Fresh lime juice: For the best bright flavor, always use freshly squeezed lime juice.

The Whipped Cream

• Heavy cream: Use heavy cream or heavy whipping cream (about 36–40% milk fat) to whip to a firm, fluffy consistency.
• Granulated sugar: A little granulated or caster sugar (or powdered sugar) stabilizes and sweetens the cream.

What type of limes should I use?

You can use any lime, but acidity and aroma vary by type. Key limes are smaller and slightly more tart, while Persian limes (commonly sold in U.S. grocery stores) are larger with milder acidity. This recipe works well with Persian limes. For best flavor, always use freshly squeezed juice rather than bottled juice.

Regular Limes vs. Key Limes

Persian limes are the common supermarket variety: larger, green, and milder. Key limes are smaller, sometimes yellowish, and a touch more acidic and aromatic. If you can find key limes, they give a more classic flavor; otherwise, Persian limes are a perfectly good choice.

How To Make Key Lime Pie

Make the crust

Preheat the oven to 325°F (163°C). Generously coat the bottom and sides of a 9-inch springform or pie pan with softened butter to help release the finished pie. Crush graham crackers in a zip-top bag with a rolling pin or pulse in a food processor. Keep some larger pieces for texture. In a bowl, combine crushed crackers, granulated sugar, and lime zest. Stir in melted butter until the crumbs are evenly moistened. Press the mixture firmly into the prepared pan, forming an even crust. Bake at 325°F (163°C) for about 12 minutes, or until the edges turn lightly golden. Cool on a rack.

Make the filling

In a bowl, whisk the egg yolks, sour cream, and lime zest until smooth and lump-free. Add the sweetened condensed milk and heavy cream, whisking to combine. Stir in the fresh lime juice and scrape the bowl with a spatula to ensure everything is evenly mixed. Pour the filling into the pre-baked crust.

Bake the filling

Bake in a preheated oven at 325°F (163°C) for about 20 minutes. The center should still have a slight jiggle—similar to the wobble of a crème brûlée—when you tap the pan. Do not overbake. Let the pie cool briefly on a rack, then refrigerate until fully chilled, at least four hours or overnight for best texture.

How do I know when the pie is done?

The surface should wobble slightly when you gently tap the side of the pan. It should not appear liquid. If it still looks runny, it needs a little more time in the oven.

Make the whipped cream topping

Whip heavy cream with sugar until very fluffy and holding stiff peaks. Spread or pipe the whipped cream over the chilled filling. To remove a springform pan more easily, gently warm the outer rim with a torch or run a warm knife around the edge, or slide a small spatula under the crust before releasing. Slice using a warmed, clean knife for neat slices.

Troubleshooting Tips

Runny filling? The pie was likely underbaked. The center should jiggle slightly but not be liquid. For accuracy, weigh ingredients when possible—this recipe is designed around weighed measurements.

Too-thick filling? It was likely overbaked. Remove the pie as soon as the center shows a slight wobble.

FAQ

• How should I store key lime pie in the fridge? Cover the cut surface with plastic wrap or store in an airtight container to prevent drying.
• How long will it keep? Refrigerated, it stays good for 3–4 days; for best flavor eat within 1–2 days.
• Can I use a pie plate instead of a springform pan? Yes. Baking time may change if the filling is thinner or thicker—watch the center for the proper jiggle.
• Can I use regular limes instead of key limes? Yes. Persian limes work well in this recipe.
• Is it necessary to pre-bake the crust? Not always. Pre-baking yields a toastier, firmer crust but you can assemble without blind-baking if you prefer.
• Should I refrigerate before serving? Yes—the filling needs to be chilled to slice cleanly.
• Can I freeze the pie? Yes. Thaw overnight in the fridge before serving.
• Can I omit the whipped cream? You can, but the whipped cream balances the tang and adds a pleasant contrast to the silky filling.

More Tangy Desserts

If you enjoy this key lime pie, try other citrus-forward desserts such as lemon madeleines, lemon pound cake, lemon mousse, lemon curd, or lemon shortbread for similar bright flavors.

Best Key Lime Pie — Recipe

Ingredients

The Crust

• 188 g (about 12 rectangular sheets) graham crackers, crushed
• 25 g (2 tablespoons) granulated sugar
• 0.5 lime, zest only
• 85 g (6 tablespoons) unsalted butter, melted

The Filling

• 75 g (4 yolks) egg yolks
• 120 g (½ cup) sour cream
• 2.5 limes, zest only
• 390 g (1¼ cups) sweetened condensed milk
• 80 g (⅓ cup) heavy cream
• 150 g (⅝ cup) fresh lime juice

Whipped Cream Topping

• 320 g (1⅓ cups) heavy cream
• 43 g (3½ tablespoons) granulated sugar

Equipment

• 9-inch springform or pie pan
• Mixing bowls
• Rubber spatula and whisk
• Zester or microplane

Method

1. Make the crust: Preheat to 325°F (163°C). Press the graham cracker mixture into the pan and bake until lightly golden, about 12 minutes. Cool on a rack.
2. Make the filling: Whisk yolks, sour cream, and lime zest until smooth. Add condensed milk and heavy cream, then fold in lime juice. Scrape the bowl to combine evenly.
3. Bake: Pour filling into crust and bake at 325°F (163°C) for about 20 minutes. The center should jiggle slightly. Cool briefly, then refrigerate until fully chilled (4 hours or overnight).
4. Top and serve: Whip cream with sugar to stiff peaks and spread on the chilled pie. Release the pan rim, slice with a warmed knife, and serve.

Nutrition (per serving, approximate)

• Calories: 400 kcal
• Carbohydrates: 38 g
• Protein: 6 g
• Fat: 26 g
• Sugar: 29 g