Preheat the oven to 350?F (175?C). In a mixing bowl, combine graham cracker crumbs, sugar, and melted butter. Mix until well combined.

Press the mixture firmly into the bottom and up the sides of a 9-inch pie pan. Bake for 8-10 minutes until lightly golden. Remove from oven and let cool.

In a mixing bowl, whisk together the key lime juice, sweetened condensed milk, and egg yolks until smooth.

Pour the filling into the cooled crust and bake for an additional 10 minutes. Remove from the oven and let cool to room temperature, then refrigerate for at least 2 hours.

In a mixing bowl, beat the heavy whipping cream, powdered sugar, and vanilla extract until stiff peaks form.

Spread the whipped cream over the chilled pie before serving.