Classic Key Lime Pie
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Key lime pie is one of those classic desserts that delivers maximum impact with minimal effort, which is exactly why I keep coming back to it. Made with a graham cracker crust and a silky, tart filling from key lime juice and egg yolks, it strikes the perfect balance between sweet and tangy in every bite. The filling bakes just until set, then chills into a smooth, custard-like texture that slices cleanly and holds its shape beautifully. I’ve made this version countless times for spring and summer gatherings, and it always disappears quickly thanks to its bright citrus flavor and creamy finish. If you’re looking for a reliable, crowd-pleasing dessert that doesn’t require complicated techniques, this is it! If you can’t get enough of citrus-forward sweets, try my classic lemon blueberry cake or this raspberry cream pie recipe next.
Why You’ll Love This Recipe
- Bright and tangy – Fresh key lime juice gives the filling a vibrant citrus flavor that balances the sweetness perfectly.
- Easy to make – A simple graham cracker crust and whisked filling come together with minimal effort.
- Make-ahead friendly – This pie sets in the refrigerator, making it ideal for entertaining or planning ahead.
What’s the Difference Between Limes and Key Limes?
Key limes are also known as Mexican limes or West Indies limes. They’re most commonly grown in Florida between June and September and in Mexico year round. One of the most obvious differences between limes and key limes is size. Key limes are much smaller than regular limes. The flavor of the tart key limes is perfectly paired with the sweetened condensed milk in the filling.
Key Ingredients in This Recipe
- Key limes – While key limes can often be found in grocery stores between June and September, key lime juice can be found in most stores year round. It’s found in the juice section or with cocktail mixers. Look for the pure juice with no additional additives if using bottled key lime juice.
- Condensed milk – Sweetened, condensed milk is made when all the water has been removed from cow’s milk and mixed with sugar. This sweet, creamy ingredient pairs perfectly with the tart limes.
- Graham crackers – Graham crackers are ground in the food processor and mixed with melted butter to create the crumbly, flavorful crust to this pie.
- Lime zest – The lime zest is the grated outer skin from the citrus to add a concentrated flavor. Use a zester or microplane to remove the zest. If you don’t have a zester use a paring knife or vegetable peeler to remove the rind and finely chop it. If you are using key lime juice rather than fresh key limes, substitute zest from regular limes.
- Eggs – While some recipes use only egg yolks, I beat whole eggs in to the mixture.
- Sour cream – Sour cream is added to the whipped cream to both thicken it and add a tangy flavor.
A full ingredient list with exact amounts can be found in the recipe card below.
Pro Tip
Let the pie chill overnight whenever possible so the filling fully sets and the flavors deepen, resulting in cleaner slices and a more balanced citrus flavor.
Swaps and Substitutions
- Key limes: Regular Persian limes can be used if key limes are unavailable, though the flavor will be slightly less floral and aromatic.
- Graham crackers: Swap with digestive biscuits or vanilla wafer cookies for a different crust flavor.
- Sweetened condensed milk: Do not substitute, as it is essential for the structure and sweetness of the filling.
- Egg yolks: Required for setting the custard and should not be replaced.
- Whipped cream: Optional topping that can be sweetened or left lightly flavored with vanilla.
How to Make Key Lime Pie (Step-by-Step)
- Blend the crust. Preheat the oven to 375°F (190ºC). Butter a 10-inch aluminum pie pan. In a food processor combine the graham crackers, sugar, cinnamon and melted butter, pulsing until the graham cracker crumbs are moist.
- Par bake the crust. Pour into the pie pan and press the crumbs evenly along the bottom of the pan and up the sides. Bake the pie crust for 15 minutes or until the crust is lightly browned. Remove from the oven and let cool.
- Whisk together the filling. While the pie crust bakes, whisk the key lime zest, lime juice, key lime juice, condensed milk, and eggs together in a large bowl.
- Bake the pie. Pour the filling into the cooled, prepared pie crust and return to the oven. Bake for 20 minutes, until the filling is set but still jiggles in the middle. Remove the pie from the oven and let cool completely. When the pan is cooled, move to the refrigerator until chilled, about 6 hours.
- Make the whipped cream. When ready to serve, prepare the whipped cream. In a stand-mixer or using a handheld mixer, whisk the heavy cream, sour cream and sugar together until the whipped cream forms stiff peaks.
- Add to a pastry bag. Spoon the whipped cream into a pastry bag fitted with a large star shape tip.
- Serve. Hold the pastry bag 1/2” over the pie then decorate the outer edges of the pie with the whipped cream. Sprinkle the pie with the remaining key lime zest and key lime slices for garnish. Serve cold.
How to Serve This Recipe
- Classic presentation: Serve chilled with a generous dollop of whipped cream on top.
- For summer gatherings: Slice into smaller wedges for easy sharing at barbecues and picnics.
- For entertaining: Garnish with fresh lime zest or thin lime slices for a clean, bright finish.
- Make it extra indulgent: Pair with fresh berries for added sweetness and color contrast.
How to Store This Recipe
- Refrigerator: Store covered in the refrigerator for up to 4 days.
- Covering: Keep tightly wrapped or in an airtight container to prevent the crust from absorbing moisture.
- Make ahead: Best made at least 4–6 hours before serving, ideally overnight.
- Freezing: Freeze tightly wrapped slices for up to 2 months, then thaw in the refrigerator before serving.
FAQ – Frequently Asked Questions
This version requires a brief bake to set the filling, but no stovetop cooking is needed, making it one of the easiest custard-style pies to prepare.
If the pie is too soft, it may need more chilling time or may not have been baked long enough to properly set the custard.
Yes, bottled key lime juice works well and is commonly used when fresh key limes are not available.
Key lime pie should chill for at least 4 hours, but overnight chilling yields the best texture and cleanest slices.
A graham cracker crust is the classic choice because its buttery sweetness balances the tart citrus filling, though cookie crusts can also be used.
Yes. Traditional key lime pie recipes use egg yolks, which help thicken and set the filling while adding richness.
Other Recipes to Try
If you loved my take on this beloved dessert that Key West is known for, check out some of my other favorite dessert recipes:
Thanks for cooking with me! If you made this recipe, leave a 🌟 rating and share your thoughts or tips below. I’d love to hear from you!
Made this dish? Be sure to rate the recipe and drop a comment below! Your feedback means everything (and helps others find it too)!
Key Lime Pie
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Ingredients:
For the crust:
- 1½ cups graham cracker crumbs
- ⅓ cup granulated sugar
- ½ teaspoon cinnamon
- 6 tablespoons unsalted butter, melted, plus more for greasing the pan
For the filling:
- 1 teaspoon key lime zest, plus additional for garnish
- 1 cup freshly squeezed lime juice
- ¼ cup freshly squeezed key lime juice
- 2 (14-ounce) cans sweetened condensed milk
- 2 eggs, at room temperature, lightly beaten
For the whipped cream:
- ½ cup heavy cream
- ½ cup sour cream
- 2 tablespoons powdered sugar
- Key lime slices, for garnish
Instructions:
For the crust:
- Preheat the oven to 375°F (190ºC). Butter a 10-inch aluminum pie pan. In a food processor combine the graham crackers, sugar, cinnamon and melted butter, pulsing until the graham cracker crumbs are moist.
- Pour into the pie pan and press the crumbs evenly along the bottom of the pan and up the sides. Bake the pie crust for 15 minutes or until the crust is lightly browned. Remove from the oven and let cool.
For the filling:
- While the pie crust bakes, whisk the key lime zest, lime juice, key lime juice, condensed milk, and eggs together in a large bowl.
- Pour the filling into the cooled, prepared pie crust and return to the oven. Bake for 20 minutes, until the filling is set but still jiggles in the middle. Remove the pie from the oven and let cool completely. When the pan is cooled, move to the refrigerator until chilled, about 6 hours.
For the whipped cream:
- When ready to serve, prepare the whipped cream. In a stand-mixer or using a handheld mixer, whisk the heavy cream, sour cream and sugar together until the whipped cream forms stiff peaks.
- Spoon the whipped cream into a pastry bag fitted with a large star shape tip.
- Hold the pastry bag 1/2” over the pie then decorate the outer edges of the pie with the whipped cream. Sprinkle the pie with the remaining key lime zest and key lime slices for garnish. Serve cold.
Nutrition:
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My cousin and I went down to Key West last month and while we were there we decided to find the best key lime pie on the island. They were all pretty good but I thought I could do better so I tried your recipe. I think I found the winner! Yours was the best by far! I can’t wait to make it for my cousin and see what she thinks.