Bright lime, a crunchy buttery base and a cloudlike cheesecake layer make this Key Lime Pie Lasagna a showstopper for backyard barbecues and summer evenings. It’s cool, citrusy and easy to prepare ahead, so you can relax while guests admire clean, creamy slices topped with toasted nuts.
Why this Key Lime Pie Lasagna shines as a summer dessert
This recipe blends three distinct textures: a shortbread-style crust, a silky cheesecake middle and a tangy cooked key lime custard. Only the crust needs baking; the rest is assembled cold. It’s ideal for hot days when you want a refreshing finish that’s also make-ahead friendly.
Ingredients broken down by layer (what you’ll need)
Crust — buttery and nutty
- 1 cup all-purpose flour
- 2 tablespoons granulated sugar
- 1/2 cup unsalted butter, melted
- 1/2 cup finely chopped macadamia nuts (or cashews, pecans)
Cheesecake layer — creamy and smooth
- 6 oz cream cheese, softened
- 2/3 cup powdered (confectioners’) sugar
- 2/3 cup whipped topping (cool whip)
- 1/2 teaspoon vanilla extract
Key lime custard — real lime flavor, not instant mix
- 2 tablespoons cornstarch
- 3/4 cup fresh key lime juice
- 3/4 cup granulated sugar
- 4 egg yolks, lightly beaten
- 5 tablespoons unsalted butter
- Green food coloring, optional
- 1 1/2 cups whipped topping
Topping
- 1 cup whipped topping
- 1/3 cup chopped nuts, toasted if desired
Step-by-step: how to build the lasagna
- Preheat the oven to 350°F and grease a 9×9-inch baking dish.
- Combine flour, sugar, melted butter and chopped nuts until crumbly. Press into the pan and bake 20 minutes. Cool completely.
- Beat cream cheese with powdered sugar until smooth. Fold in 2/3 cup whipped topping and vanilla. Spread this cheesecake layer over the cooled crust and chill while you make the custard.
- For the custard: whisk cornstarch and sugar in a saucepan. Stir in key lime juice and the beaten yolks. Add butter and cook over medium-low, stirring constantly, until thick enough to coat a spoon.
- Cover the custard with plastic so a skin doesn’t form and refrigerate at least 2 hours, until fully cooled.
- Once cooled, tint the custard slightly if you like. Fold in 1 1/2 cups whipped topping, spread over the cheesecake layer, then add the remaining whipped topping on top.
- Sprinkle chopped nuts over the finish. Chill the assembled dessert 4–5 hours or overnight for best slicing.
- Optionally freeze for a firmer, ice-cream-like slice. It thaws quickly for neat portions.
Timing, yield and helpful baking notes
- Prep time: about 20 minutes active.
- Oven time: 20 minutes for the crust.
- Chill time: plan on about 7 hours total chilling (2 hours for custard, 4–5 hours assembled).
- Yield: makes roughly 9 servings.
- Using fresh key lime juice gives the brightest, most authentic flavor. Store-bought juice will work, but the taste will be less vibrant.
- If you prefer a lighter nut profile, substitute toasted chopped cashews or pecans.
Storage, make-ahead tips and serving suggestions
- This dessert keeps well in the fridge up to 3 days. Cover tightly to prevent moisture buildup.
- Freeze portions for up to 2 weeks. Let slices sit at room temperature 10–15 minutes before serving.
- Garnish with lime zest or thin lime slices for extra color and aroma.
- Serve chilled after a heavy meal; the tart lime cuts through richness and refreshes the palate.
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