Let’s dive into the creation process, which is as straightforward as can be. Here’s how to bring these bars to life:

1. Preheat your oven to 350°F (175°C). Line an 8×8-inch baking dish with parchment paper, leaving some overhang for easy removal.
2. In a medium bowl, combine the graham cracker crumbs, melted butter, and granulated sugar. Mix until the crumbs are evenly coated.
3. Press the crumb mixture firmly into the bottom of the prepared baking dish. Bake for 10 minutes or until the crust is lightly golden. Let cool slightly.
4. In a separate bowl, whisk together the egg yolks and sweetened condensed milk until smooth. Add the key lime juice, lime zest, and salt, whisking until fully combined.
5. Pour the lime mixture over the baked crust, spreading it evenly. Bake for 15 minutes, or until the filling is set but still slightly jiggly in the center.
6. Allow the bars to cool to room temperature, then refrigerate for at least 2 hours to firm up before slicing into squares.

Patience is key here. As tempting as it is to dive in immediately, giving these bars time to chill will ensure that they hold their shape beautifully.