Easy Creamy Key Lime Cheesecake Bars

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If you are looking for the ultimate crowd-pleasing dessert that perfectly balances zesty citrus with ultra-creamy rich sweetness, these Key Lime Cheesecake Bars are an absolute must-try. Featuring a buttery graham cracker crust, a velvety smooth key lime cheesecake filling, and topped with dollops of whipped cream and fresh lime zest, this simple slab-style dessert brings tropical sunshine straight to your kitchen.

Ingredients List

For the Graham Cracker Crust

  • 2 cups graham cracker crumbs (about 14–16 full sheets)
  • 1/3 cup granulated sugar
  • 6 tablespoons unsalted butter, melted

For the Key Lime Cheesecake Filling

  • 16 oz (2 blocks) cream cheese, softened to room temperature
  • 1/2 cup granulated sugar
  • 1/2 cup sour cream or full-fat Greek yogurt, room temperature
  • 1/2 cup key lime juice (freshly squeezed or bottled Key Lime juice)
  • 1 tablespoon fresh key lime zest
  • 2 large eggs, room temperature

For the Whipped Cream Topping & Garnish

  • 1 cup heavy whipping cream, cold
  • 3 tablespoons powdered sugar
  • 1 teaspoon vanilla extract
  • Fresh lime slices and extra lime zest for garnish

Step-by-Step Instructions

Step 1: Prepare the Graham Cracker Crust

  1. Preheat your oven to 350°F (175°C). Line a 9 \times 13-inch baking dish with parchment paper, leaving an overhang on the sides for easy removal.
  2. In a medium bowl, combine the graham cracker crumbs, granulated sugar, and melted butter. Mix until the crumbs are evenly coated and resemble wet sand.
  3. Press the mixture firmly into the bottom of the prepared baking dish in an even layer.
  4. Bake for 8 to 10 minutes until lightly golden and set. Remove from the oven and let cool completely while preparing the filling.

Step 2: Make the Key Lime Filling

  1. Reduce oven temperature to 325°F (165°C).
  2. In a large mixing bowl or stand mixer fitted with the paddle attachment, beat the softened cream cheese and granulated sugar together on medium speed for about 2 minutes until smooth and creamy.
  3. Add the sour cream, key lime juice, and key lime zest. Mix on low speed until fully incorporated.
  4. Add the eggs one at a time, mixing on low speed just until blended after each addition. Pro tip: Do not overmix after adding the eggs to prevent air bubbles in your cheesecake.

Step 3: Bake and Chill

  1. Pour the lime filling over the cooled graham cracker crust and smooth the top evenly with a spatula.
  2. Bake at 325°F for 30 to 35 minutes, or until the edges are set but the center still has a slight wobble.
  3. Turn off the oven and leave the door slightly ajar for 15 minutes to prevent cracking.
  4. Remove from the oven and allow to cool to room temperature on a wire rack. Once cooled, cover and refrigerate for at least 4 hours (or overnight) until completely chilled and firm.

Step 4: Decorate and Serve

  1. In a chilled bowl, beat the heavy whipping cream, powdered sugar, and vanilla extract on high speed until stiff peaks form.
  2. Transfer the whipped cream to a piping bag fitted with a large star tip.
  3. Lift the cheesecake slab out of the baking dish using the parchment paper overhang.
  4. Cut into even square bars. Pipe a generous swirl of whipped cream on top of each bar and sprinkle with fresh lime zest before serving.

Storage & Freezing Tips

  • Refrigeration: Store leftover bars in an airtight container in the refrigerator for up to 5 days.
  • Freezing: Wrap individual sliced bars (without whipped cream topping) tightly in plastic wrap and aluminum foil. Freeze for up to 3 months. Thaw overnight in the fridge before decorating and serving.