Melt dark chocolate chips gently over a double boiler or in the microwave.
Let melted chocolate cool slightly.
In a mixing bowl, beat softened butter and granulated sugar until light and fluffy.
Add eggs one at a time, beating well after each addition.
Mix in vanilla extract and salt.
Slowly blend in melted chocolate until smooth and silky.
Pour filling into pre-baked pie crust and smooth the top.
Refrigerate for at least 4 hours until fully set.
Whip heavy cream with powdered sugar until soft peaks form.
Spread or pipe whipped cream over chilled pie.
Garnish with dark chocolate shavings before serving.
