Preheat oven to 375°F
Pie crust. Using a food processor combine almond flour, erythritol, cold butter, cocoa powder, vanilla extract, baking powder, and salt. Add the egg and combine until well incorporated. Grease a 9-inch non-stick round cake pan with butter or cooking spray. Press the dough firmly into the bottom and up the sides of the cake pan to create a crust. Bake in a preheated oven for 10-15 mins.
Filling. In a large mixing bowl beat together cream cheese, heavy cream, erythritol, cocoa powder, chocolate, sour cream, and vanilla extract, using an electric mixer until fluffy.
When the chocolate pie crust has cooled, transfer the cream cheese filling to the pan and spread evenly. Refrigerate for at least 6 hours (or refrigerate pie overnight).
Topping. In a mixing bowl whip heavy cream, powdered erythritol, and vanilla extract until thickened.
Serve Keto French Silk Pie with whipped cream topping and garnish with chocolate shavings.