Follow these simple steps to create your very own Key Lime Pie:

1. Preheat the Oven: Begin by preheating your oven to 350°F (175°C).
2. Prepare the Crust: In a mixing bowl, combine graham cracker crumbs, granulated sugar, and melted butter. Mix until fully combined.
3. Form the Crust: Press the crumb mixture into the bottom and up the sides of a 9-inch pie pan. Ensure it’s evenly distributed.
4. Bake the Crust: Place the crust in the oven and bake for 8-10 minutes until lightly golden. Remove and let it cool.
5. Make the Filling: In a separate bowl, whisk together the egg yolks until they are pale and thick. Add the sweetened condensed milk and whisk until well blended.
6. Add Lime Juice: Gradually add the key lime juice and lime zest (if using) to the mixture, whisking until smooth.
7. Pour the Filling: Pour the lime filling into the cooled pie crust, spreading it evenly.
8. Bake the Filling: Return the pie to the oven and bake for another 15-20 minutes until the filling is set but still slightly jiggly.
9. Cool the Pie: Remove from the oven and allow it to cool to room temperature. Then refrigerate for at least 1 hour to chill thoroughly.
10. Prepare Topping: In a mixing bowl, beat the heavy cream and powdered sugar together until soft peaks form.
11. Serve: Spread the whipped cream over the chilled pie and garnish with lime wedges and additional zest.

These steps will guide you in creating your own incredible Key Lime Pie effortlessly!