Place the graham cracker crumbs in a large bowl with the white sugar, then stir them together with a fork to combine.
Add the melted unsalted butter, then stir into the graham cracker crumbs until it resembles wet sand.
Pour the crust mixture into a non-stick 9-inch tart pan with a removable bottom (or a 9-inch pie plate).
Then, using your hands, press the crumbs into the bottom and up the sides of the tart pan to form the crust. Place the pan on a parchment lined baking sheet, and bake in a 350°F oven for 10 minutes.
After 10 minutes, remove the crust from the oven and set it on a wire cooling rack.
To Make the Filling
In a large bowl, place the egg yolks, the Key lime juice, and the sweetened condensed milk.
Using an electric hand mixer, beat the filling for two minutes until it is smooth and creamy.
Then, using a large ice cream scoop, transfer the filling into the baked crust. Return the pan to the 350°F oven and bake for 10 minutes.
After 10 minutes, remove the pan from the oven and allow it to cool on a wire rack until it reaches room temperature. Once it reaches room temperature, place the tart pan, uncovered, in the refrigerator overnight.
To Make the Stabilized Whipped Cream
(Make this right before you are ready to serve the pie.) Place the room-temperature cream cheese and powdered sugar in a large bowl. Beat for 2-3 minutes using an electric hand mixer until smooth and creamy.
Add the vanilla extract and cold, heavy whipping cream. Beat with the hand mixer until stiff peaks form.
To Finish the Classic Key Lime Pie
Remove the Classic Key Lime Pie from the refrigerator. If you used a tart pan, carefully remove the sides and bottom of the pan. If you use a pie pan, you can leave it in the pan.
Then, place a large star tip in a piping bag and using a large ice cream scoop, add the stabilized whipped cream to the piping bag.
Next, pipe a ring of stabilized whipped cream around the edge of the Classic Key Lime Pie. Garnish with small pieces of limes.
Yield 12 servings. Enjoy!
Tips/Notes
The reason you should refrigerated it uncovered is that when you cover something at room temperature, then refrigerate it, condensation will form on top.