01 -
Preheat the oven to 350°F. Set a rack in the center of the oven.
02 -
Mix graham cracker crumbs, sugar, melted butter, and salt until evenly moistened. Press firmly into the bottom and sides of a 9-inch pie plate.
03 -
Bake the crust for 9-10 minutes, until lightly golden and fragrant. Let it cool for 10 minutes while you make the filling.
04 -
Whisk sweetened condensed milk, egg yolks, key lime juice, lime zest, and salt until smooth and slightly thickened.
05 -
Pour the filling into the warm crust. Bake for 15-17 minutes, until the edges are set and the center still has a gentle wobble.
06 -
Cool the pie on a rack for 1 hour, then refrigerate for at least 3 hours or overnight before topping.
07 -
Beat cold heavy cream, powdered sugar, and vanilla to soft peaks. Spoon or pipe over the chilled pie and garnish with lime slices or zest.