Creating the perfect Key Lime Pie Bars is easy with these clear steps:

1. Preheat the oven: Set your oven to 350°F (175°C) and prepare an 8×8-inch baking dish by greasing it or lining it with parchment paper.
2. Make the crust: In a bowl, combine graham cracker crumbs and granulated sugar. Stir in the melted butter and mix until the crumbs are coated. Press this mixture evenly into the bottom of your prepared baking dish.
3. Bake the crust: Place the crust in the preheated oven and bake for about 8-10 minutes, or until lightly browned. Remove and allow it to cool slightly.
4. Prepare the filling: In a medium bowl, whisk together the egg yolks until smooth. Add the sweetened condensed milk, key lime juice, lime zest, and salt. Whisk until the mixture is well combined and smooth.
5. Combine filling and crust: Pour the key lime filling over the cooled crust. Spread it evenly across the top.
6. Bake the bars: Return the baking dish to the oven and bake for another 25-30 minutes, or until the filling is set but still slightly jiggly in the center.
7. Cool the bars: Remove from the oven and allow the dish to cool at room temperature for about 15-20 minutes. Then, refrigerate for at least 2 hours until fully chilled and set.
8. Slice and serve: Once chilled, lift the bars out using the parchment paper for easy slicing. Cut into squares and dust with powdered sugar before serving.

These straightforward instructions will guide you through the baking process with ease, ensuring that your Key Lime Pie Bars turn out wonderfully each time!