Key Lime Pie Ice Cream With Graham Cracker Crumbles

Quick Recipe Version (TL;DR)

• Yield: 1 1/2 quarts, about 8 servings
• Prep Time: 35 minutes
• Cook Time: 20 minutes
• Total Time: 9 hours 20 minutes, including chilling and freezing

Quick Ingredients

• Custard: 2 cups heavy cream, 1 cup whole milk, 3/4 cup granulated sugar, 1/4 teaspoon fine sea salt, 5 large egg yolks, 1 tablespoon finely grated key lime zest, 1/2 cup fresh key lime juice, 1 teaspoon vanilla extract
• Graham crumbles: 1 1/4 cups graham cracker crumbs, 3 tablespoons unsalted butter, 2 tablespoons light brown sugar, 1/8 teaspoon fine sea salt, 1/4 teaspoon ground cinnamon
• Condensed milk swirl: 2/3 cup sweetened condensed milk, 1 tablespoon heavy cream, 1/2 teaspoon vanilla extract, 1 teaspoon key lime juice, 1 pinch fine sea salt

Do This

• 1. Freeze your ice cream maker bowl for at least 24 hours if required; preheat the oven to 325°F.
• 2. Bake graham crumbs with melted butter, brown sugar, salt, and cinnamon for 8 to 10 minutes; cool completely.
• 3. Heat cream, milk, sugar, and salt to 165°F, then temper into egg yolks.
• 4. Cook the custard over medium-low heat to 170°F to 175°F, strain, stir in zest and vanilla, then chill for at least 4 hours.
• 5. Whisk cold key lime juice into the chilled custard and churn for 20 to 25 minutes.
• 6. Layer churned ice cream with graham crumbles and condensed milk swirl, then freeze for at least 4 hours before scooping.

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Why You’ll Love This Recipe

• It tastes like key lime pie in frozen form: creamy, tart, buttery, sweet, and refreshing all at once.
• The texture is scoop-shop rich: a cooked custard base gives the ice cream a smooth, velvety finish.
• The mix-ins stay exciting: toasted graham cracker crumbles add buttery crunch while condensed milk creates soft, sweet ribbons.
• Perfect for warm weather: bright key lime flavor makes this dessert feel light and sunny even though it is wonderfully creamy.

Grocery List

• Produce: 20 to 24 key limes, or enough for 1/2 cup juice and 1 tablespoon zest
• Dairy: Heavy cream, whole milk, large eggs, unsalted butter, sweetened condensed milk
• Pantry: Granulated sugar, light brown sugar, graham crackers, vanilla extract, fine sea salt, ground cinnamon

Full Ingredients

For the Key Lime Custard Base

• 2 cups heavy cream
• 1 cup whole milk
• 3/4 cup granulated sugar
• 1/4 teaspoon fine sea salt
• 5 large egg yolks
• 1 tablespoon finely grated key lime zest, from about 8 to 10 key limes
• 1/2 cup fresh key lime juice, from about 20 to 24 key limes, chilled
• 1 teaspoon vanilla extract

For the Buttery Graham Cracker Crumbles

• 1 1/4 cups graham cracker crumbs, from about 9 full graham cracker sheets
• 3 tablespoons unsalted butter, melted
• 2 tablespoons packed light brown sugar
• 1/8 teaspoon fine sea salt
• 1/4 teaspoon ground cinnamon

For the Sweetened Condensed Milk Swirl

• 2/3 cup sweetened condensed milk
• 1 tablespoon heavy cream
• 1/2 teaspoon vanilla extract
• 1 teaspoon key lime juice
• 1 pinch fine sea salt

Optional Garnishes for Serving

• 1 tablespoon extra graham cracker crumbs
• 1 teaspoon finely grated key lime zest
• Thin key lime slices or small wedges

Step-by-Step Instructions

Step 1: Prepare your equipment and preheat the oven

If your ice cream maker uses a freezer bowl, place the bowl in the freezer at least 24 hours before churning. For smoothest results, also place a 9 by 5-inch metal loaf pan or a 1 1/2-quart freezer-safe container in the freezer for 20 minutes before layering the ice cream later.

Preheat the oven to 325°F. Line a rimmed baking sheet with parchment paper so the graham crumbles lift off easily after baking.

Step 2: Make the buttery graham cracker crumbles

In a medium bowl, stir together 1 1/4 cups graham cracker crumbs, 3 tablespoons melted unsalted butter, 2 tablespoons light brown sugar, 1/8 teaspoon fine sea salt, and 1/4 teaspoon ground cinnamon until the mixture looks evenly moistened and resembles damp sand with a few small clumps.

Spread the crumbs on the prepared baking sheet in a thin, even layer. Bake at 325°F for 8 to 10 minutes, stirring once halfway through, until the crumbs smell toasty and look slightly darker. Let them cool completely on the pan for at least 20 minutes. Once cool, break them into a mix of pea-size clusters and sandy crumbs.

Step 3: Warm the dairy mixture

In a medium heavy-bottomed saucepan, combine 2 cups heavy cream, 1 cup whole milk, 3/4 cup granulated sugar, and 1/4 teaspoon fine sea salt. Warm over medium heat, stirring often, until the sugar dissolves and the mixture reaches 165°F on an instant-read thermometer. Do not let it boil.

While the dairy warms, place 5 large egg yolks in a medium heatproof bowl and whisk until smooth and slightly thickened, about 30 seconds.

Step 4: Temper and cook the custard

Slowly ladle about 1 cup of the hot cream mixture into the egg yolks while whisking constantly. This gently warms the yolks so they do not scramble. Pour the warmed yolk mixture back into the saucepan, whisking as you add it.

Cook the custard over medium-low heat, stirring constantly with a heatproof spatula and scraping the bottom and corners of the pan, until the mixture reaches 170°F to 175°F and lightly coats the back of the spatula. This usually takes 5 to 7 minutes. The custard should look silky and slightly thick, not foamy or curdled. Remove it from the heat immediately.

Step 5: Strain, flavor, and chill the custard

Pour the hot custard through a fine-mesh sieve into a clean bowl to remove any small bits of cooked egg. Stir in 1 tablespoon finely grated key lime zest and 1 teaspoon vanilla extract.

For faster chilling, set the bowl of custard inside a larger bowl filled with ice water and stir for 5 minutes. Cover the custard with plastic wrap or parchment pressed directly against the surface, then refrigerate until very cold, at least 4 hours or up to 24 hours. The custard should be 40°F or colder before churning.

Step 6: Finish the key lime custard and prepare the swirl

When the custard is fully chilled, whisk in 1/2 cup cold fresh key lime juice gradually, about 1 tablespoon at a time. Adding the lime juice after chilling keeps the custard smooth and gives the ice cream a clean, bright tartness. Taste the base; it should be tangy because the flavor will mellow once frozen.

In a small bowl, stir together 2/3 cup sweetened condensed milk, 1 tablespoon heavy cream, 1/2 teaspoon vanilla extract, 1 teaspoon key lime juice, and 1 pinch fine sea salt until smooth. Refrigerate the swirl mixture until you are ready to layer the ice cream.

Step 7: Churn the ice cream

Pour the cold key lime custard into your ice cream maker and churn according to the manufacturer’s instructions. Most machines take 20 to 25 minutes. The finished ice cream should look thick, creamy, and similar to soft serve.

During the final 1 minute of churning, add about 1/2 cup of the cooled graham cracker crumbles. Reserve the remaining crumbles for layering so you get pockets of pie-crust texture throughout the ice cream.

Step 8: Layer the condensed milk swirls and freeze

Spoon one-third of the churned ice cream into the chilled loaf pan or freezer container. Drizzle with one-third of the condensed milk swirl and sprinkle with one-third of the remaining graham cracker crumbles. Repeat the layers two more times.

Use a butter knife or skewer to gently swirl through the layers just 2 or 3 times. Do not overmix, or the condensed milk will disappear into the ice cream instead of forming ribbons. Cover tightly and freeze at 0°F for at least 4 hours, or until firm enough to scoop.

Step 9: Scoop and serve

Let the ice cream sit at room temperature for 5 to 10 minutes before scooping. Serve in chilled bowls or cones with extra graham cracker crumbs, a little key lime zest, and thin key lime slices if you like.

Pro Tips

• Use a thermometer for the custard: Pull it from the heat at 170°F to 175°F. Above 180°F, the eggs can curdle and turn grainy.
• Add lime juice only after the custard is cold: This keeps the dairy smooth while preserving the bold, fresh key lime flavor.
• Keep the mix-ins cool: Warm graham crumbs or warm condensed milk can melt the churned ice cream and create icy patches.
• Do not overswirl: A few gentle passes are enough for thick, visible ribbons of sweetened condensed milk.
• If key limes are hard to find: Use bottled key lime juice in the base and fresh Persian lime zest for fragrance. Fresh juice is best, but bottled key lime juice still gives the classic flavor.

Variations

• Coconut Key Lime Pie Ice Cream: Replace 1 cup of the heavy cream with 1 cup full-fat canned coconut milk and add 1/2 cup toasted sweetened coconut flakes with the graham crumbles.
• Key Lime Cheesecake Ice Cream: Whisk 4 ounces softened cream cheese into the warm strained custard before chilling for a tangy cheesecake-style base.
• Extra-Crunchy Pie Crust Ice Cream: Double the graham crumble recipe and use up to 2 cups total crumbles, adding half during the final minute of churning and half during layering.

Storage & Make-Ahead

Store the ice cream in an airtight freezer-safe container at 0°F for up to 2 weeks for the best flavor and texture. Press a piece of parchment paper or plastic wrap directly onto the surface before covering to help prevent ice crystals. Let the ice cream soften at room temperature for 5 to 10 minutes before scooping.

The custard base can be made and refrigerated up to 24 hours before churning. The graham cracker crumbles can be baked up to 3 days ahead and stored in an airtight container at room temperature. The condensed milk swirl can be mixed up to 1 week ahead and refrigerated; stir it well before using.

Nutrition (per serving)

Calories: 545 kcal | Carbs: 52g | Protein: 7g | Fat: 35g | Saturated Fat: 20g | Fiber: 1g | Sugar: 43g | Sodium: 230mg | Cholesterol: 220mg