Preheat your oven to 350°F (175°C) to get it ready for baking.

In a mixing bowl, combine the graham cracker crumbs, sugar, and melted butter. Mix well until crumbly.

Press the mixture firmly into the bottom of a greased 8-inch square baking pan, making an even layer.

In another bowl, whisk together the sweetened condensed milk, Key lime juice, eggs, and lime zest until smooth and well combined.

Pour the Key lime mixture over the prepared crust in the baking pan, ensuring it’s evenly distributed.

Place the pan in the oven and bake for 15-20 minutes, or until the filling is set and the edges are lightly bubbling.

Allow the bars to cool completely in the pan on a wire rack.

Once cooled, refrigerate for at least 2 hours.

Cut into bars and optionally dust with powdered sugar before serving.