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+ servings
key lime bars stacked up on a white serving board with powdered sugar

Key Lime Bars

Key Lime Bars are an easy key lime bar recipe with a buttery, flakey crust topped with a sweet, tangy key lime filling and powdered sugar!

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For the crust:

  • 1/2 cup unsalted butter softened
  • 1/4 cup powdered sugar
  • 1 cup all purpose flour
  • 1/4 teaspoon salt

For the filling:

  • 3 large eggs
  • 1 cup granulated sugar
  • 3 tablespoons all purpose flour
  • 1 tablespoon lime zest
  • 1/2 cup key lime juice
  • 1/2 cup sifted powdered sugar for garnish


  • Preheat oven to 350 degrees. Line an 8x8" baking dish with parchment paper or foil.

Prepare the crust:

  • In a large bowl, beat the butter and 1/4 cup powdered sugar till light and fluffy, about 2-3 minutes. Add flour and salt, and beat on low speed until just incorporated.
  • Scrape the dough into the prepared pan and spread evenly with an offset spatula. Bake on the middle rack of the oven 20-25 minutes, or until lightly golden. Remove from the oven and cool on a wire rack while you prepare the filling.

Prepare the filling:

  • In a medium bowl, whisk the eggs and granulated sugar until well incorporated. Add the 3 tablespoons of flour and whisk until combined, then whisk in the lime juice and zest.
  • Pour the filling over the cooled crust, and bake 20-25 minutes longer, or until the filling has set. The filling will not "wiggle" when the pan is moved gently back and forth. Remove from heat and cool completely on a wire rack.
  • Once the key lime bars have cooled, cut into squares with a sharp knife, wiping the knife clean in between slices. Dust with powdered sugar, serve and enjoy!


  • This recipe is easily doubled and baked in a 9x13" glass baking dish.  For best results, use a glass baking dish.
  • Bars should be cooled completely at room temperature.  Dust with powdered sugar just before serving.
  • Refrigerate leftover key lime bars in an air tight container in the refrigerator for up to 5 days.
  • (1) bag of key limes contains about 20 limes, which yields a minimum of 1/2 cup key lime juice.  
  • Zest and juice key limes, then add the zest to the juice.  This may be done up to 2 days in advance and may be frozen.
  • Can't find key limes?  You can easily substitute the key lime juice with any type of citrus juice. Lemon, orange, blood orange or grapefruit are all great options.


Serving: 1g, Calories: 312kcal, Carbohydrates: 48g, Protein: 4g, Fat: 12g, Saturated Fat: 7g, Polyunsaturated Fat: 4g, Cholesterol: 89mg, Sodium: 85mg, Fiber: 1g, Sugar: 35g

Nutrition is estimated using a food database and is only intended to be used as a guideline for informational purposes.

Did you try this recipe?Be sure to tag @flavorthemoments with the hashtag #flavorthemoments on Instagram so I can see what you made!