This elegant pie offers a silky, creamy dessert experience. Its impressive presentation makes it a wonderful choice for celebrations or family gatherings.
Stir together the chocolate cookie crumbs and melted butter until evenly moistened. Press the mixture firmly into the bottom and up the sides of a 9-inch pie dish. Refrigerate for at least 20 minutes to set.
Melt the chopped unsweetened baking chocolate in a microwave-safe bowl in 30-second intervals, stirring between each, until completely smooth. Set aside and let it cool to room temperature. It should be liquid but not warm to the touch.
In a large bowl, beat the softened butter with an electric mixer on medium-high speed until very light and creamy, about 2 minutes. Gradually add the sifted powdered sugar and continue beating for another 3 minutes until pale and fluffy. Mix in the vanilla extract and the cooled melted chocolate until fully incorporated.
Add the pasteurized eggs one at a time, beating on high speed for 3 to 4 minutes after each addition. This extended beating is what creates the signature silky, mousse-like texture. The filling should be incredibly smooth and airy when finished.
Spoon the filling into the chilled crust and spread it evenly with a spatula. Refrigerate for at least 4 hours or overnight until the filling is completely firm and sliceable.
Before serving, whip the heavy cream and powdered sugar together until stiff peaks form. Spread or pipe the whipped cream over the top of the pie.
Garnish generously with chocolate shavings. Slice with a warm utensil for the cleanest pieces. Store in the refrigerator.