1-First: preheat your oven to 350°F and line a 9-inch square baking pan with parchment paper, leaving an overhang for easy lifting. This step helps with cleanup and ensures your bars come out neatly.

2-Next: prepare the crust by grinding the graham crackers into crumbs, then stirring in the sugar and melted butter. Press the mixture firmly into the bottom of the pan and prebake for 10 minutes to get that crispy base.

3-For the filling, beat the cream cheese until smooth, add the egg yolks and mix well, then incorporate the sweetened condensed milk, key lime juice, and lime zest until fully combined and smooth. Pour this over the warm حد crust and bake for 18-20 minutes, or until the edges are set and the center is slightly jiggly.

4-After baking, cool the bars at room temperature for 30 minutes, then chill in the refrigerator for 2-3 hours. Once ready, lift the bars out using the parchment paper overhang and slice into squares. Prep time is about 15 minutes, with bake time around 30 minutes, plus cooling and chilling for a total of about 3 hours and 30 minutes.