Key Lime Pie Bars
A buttery graham crust and a smooth, tangy lime filling finished with whipped cream.
Key Lime Pie Bars have a buttery graham crust and a smooth, tangy lime filling finished with whipped cream. Careful mixing and complete cooling protect the crumb, filling, or crust from becoming heavy.
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Ingredients
For the Crust
- 1 1/2 cups graham cracker crumbs
- 1/4 cup granulated sugar
- 6 tablespoons unsalted butter, melted
For the Filling
- 2 cans (14 ounces each) sweetened condensed milk
- 4 large egg yolks
- 3/4 cup key lime juice
- 1 tablespoon finely grated lime zest
- 1/4 teaspoon salt
For Serving
- Whipped cream
- Thin lime slices or extra zest
Substitutions
- Use regular Persian limes when Key limes are unavailable; the flavor will be slightly less floral.
- Use gluten-free graham crackers for a gluten-free crust.
- Use sweetened condensed coconut milk for a dairy-free variation, noting that the set may be softer.
Instructions
Step 1: Prepare the pan
Heat the oven to 350°F. Line an 8-inch square pan with parchment, leaving overhang on two sides.
Step 2: Bake the crust
Mix graham crumbs, sugar, and butter. Press firmly into the pan and bake for 10 minutes.

Step 3: Mix the filling
Whisk condensed milk, yolks, lime juice, zest, and salt until smooth and slightly thickened.

Step 4: Bake
Pour over the warm crust and bake 14 to 16 minutes, until the center is set but still has a slight wobble.

Step 5: Chill and slice
Cool completely, then refrigerate at least 3 hours. Lift from the pan and cut into 16 bars.

How to Store Leftovers
Cool Key Lime Pie Bars completely before covering. Store it airtight at cool room temperature for up to 2 days, or refrigerate for up to 4 days if the kitchen is warm or the recipe contains fresh fruit.
How to Reheat
Serve Key Lime Pie Bars at room temperature unless the recipe is intended warm. Heat individual portions briefly and avoid overheating frosting, glaze, or fruit filling.
Serving Ideas
- Powdered sugar or whipped cream
- Fresh berries
- Coffee or tea
- A dessert platter
Common Mistakes to Avoid
- Overmixing after flour is added.
- Cutting or frosting before cooling.
- For Key Lime Pie Bars, relying on color alone instead of the center cue.
Nutrition Information
| Nutrient | Per Serving |
|---|---|
| Calories | 285 |
| Protein | 5g |
| Carbohydrates | 43g |
| Fat | 11g |
| Sugar | 34g |
Nutrition is an estimate and can vary with brands, portion size, and substitutions.
Frequently Asked Questions
What is the clearest doneness cue for Key Lime Pie Bars?
Pour over the warm crust and bake 14 to 16 minutes, until the center is set but still has a slight wobble.
What substitution works well in Key Lime Pie Bars?
Use regular Persian limes when Key limes are unavailable; the flavor will be slightly less floral.
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