- Mix the Filling: In a large mixing bowl, whisk together the sweetened condensed milk, key lime juice, egg yolks, and lime zest (if using) until the mixture is smooth and well combined.
- Pour the Filling: Pour the lime mixture over the cooled crust, spreading it evenly with a spatula.
- Bake the Bars: Return the baking dish to the oven and bake for 15-20 minutes, or until the filling is set and the edges are slightly golden. The center should jiggle slightly when shaken but will firm up as it cools.
- Cool and Chill: Remove the bars from the oven and let them cool to room temperature. Once cooled, cover the baking dish and refrigerate for at least 2 hours, or until fully chilled and firm.
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Making the Whipped Cream Topping
- Whip the Cream: In a large mixing bowl, whip the heavy whipping cream with an electric mixer on medium-high speed until soft peaks form.
- Add Sugar: Gradually add the powdered sugar and continue whipping until stiff peaks form.
- Spread the Topping: Once the bars are chilled, spread the whipped cream evenly over the top using a spatula. You can also pipe the whipped cream for a more decorative finish.
Garnishing and Serving
- Garnish: If desired, garnish the bars with lime zest or chopped nuts for added texture and flavor.
- Slice and Serve: Use a sharp knife to slice the bars into squares or rectangles. Serve chilled and enjoy the bright, tangy flavor of key lime in every bite.
