Combine graham cracker crumbs, sugar, and melted butter. Press into a 9-inch pie dish.
Bake at 350°F (175°C) for 8 minutes and let cool slightly.
Whisk egg yolks and lime zest until thick, then beat in condensed milk.
Gradually add lime juice until smooth.
Pour into crust and bake 12 minutes until just set.
Cool, then refrigerate at least 3 hours.
Whip cream with powdered sugar and vanilla until soft peaks form.
Top chilled pie with whipped cream and lime zest before serving.
See full steps with tips & photos → https://ekellyn.com/key-lime-pie-florida-style/