Preheat your oven to 375°F (190°C) and grab a 9-inch pie plate. In a mixing bowl, combine melted butter, graham cracker crumbs, and granulated sugar until it resembles wet sand. Firmly press this mixture into the bottom and up the sides of the pie plate, using the back of a measuring cup for a smooth finish. Bake for 7-8 minutes until lightly golden, then allow to cool completely.

In a large saucepan, whisk together granulated sugar, cornstarch, and salt over medium-low heat. Gradually stir in the milk and 1 cup of heavy cream, along with the bittersweet chocolate chips and semisweet chocolate. Keep whisking continuously until the mixture thickens and reaches a gentle boil, about 1-2 minutes after boiling, becoming glossy and smooth.

To prevent scrambling, temper the egg yolks by slowly adding small amounts of the hot chocolate mixture into them, whisking constantly. Once combined, pour the egg yolk mixture back into the saucepan with the remaining chocolate filling. Cook on low heat for another 1-2 minutes, stirring continuously until the filling thickens and is smooth, then remove from heat.

Stir in the vanilla extract, allowing its rich aroma to enhance the filling. Carefully pour this luxurious chocolate mixture into the cooled graham cracker crust, ensuring it evenly fills the base. Cover the pie with plastic wrap directly on the filling surface to prevent a skin from forming, then refrigerate it for at least 4 hours or overnight, allowing the flavors to meld beautifully.

When ready to serve the Chocolate Cream Pie, prepare the whipped topping by placing the remaining heavy cream in a mixing bowl. Beat with an electric mixer until soft peaks form, then gradually add powdered sugar while continuing to whip until stiff peaks are achieved.

After the pie has chilled and set, remove it from the refrigerator. Generously spread or pipe the whipped cream on top for an inviting finish. For an elegant touch, garnish with chocolate shavings made using a vegetable peeler. Slice, serve, and enjoy this decadent Chocolate Cream Pie that promises to please every chocolate lover!