First, chop your unsweetened chocolate. Put it in a microwave-safe bowl. Heat it for 30 seconds. Stir the chocolate very well. Heat it again if needed. Let it cool down a bit. It should be smooth and liquid.
Cream Butter and Sugar
Put softened butter in a bowl. Add the granulated sugar. Use your mixer on high speed. Beat them for 3 minutes. The mix should be very fluffy. It will look light and pale.
Add Melted Chocolate
Pour the melted chocolate into the bowl. Add your vanilla extract now. Mix it on medium speed. Scrape the sides of the bowl. Make sure the color is even. It will smell like rich cocoa.
Add the First Two Eggs
Add two eggs to the mix. Set your timer for 5 minutes. Beat the mixture on medium-high. Do not stop early. This builds the silky texture. The sugar needs to dissolve fully.
Add the Remaining Eggs
Add the last two eggs. Beat for another 5 minutes. This step is very important. The filling will become very glossy. It will look like thick mousse. This is the "silk" part.
Fill the Pie Crust
Pour the chocolate into the crust. Use a spatula to smooth it. Spread it to the very edges. Make the top nice and flat. It is ready for the fridge.
Chill the Pie
Cover the pie with plastic wrap. Put it in the refrigerator. Let it sit for 6 hours. Over-night is even better for slicing. The pie needs to be firm.
Add Topping and Serve
Whip the heavy cream and powdered sugar. Spread it over the chocolate. Top with chocolate shavings. Slice it while it is cold. Enjoy your delicious homemade treat!