In a small microwave safe bowl, melt chocolate in 30 second increments, stirring in between each increment until smooth. Let cool down and set aside.
In a large bowl, cream and beat butter and sugar for about 2 minutes until fluffy. Add melted chocolate to butter mixture. Add in vanilla and beat until combined.
Continue to beat mixture for 15-20 minutes at medium speed, adding eggs in one at a time spacing them about 5 minutes apart before adding the next one.
Pour into cool baked pie shell and evenly and carefully spread over pie. Cover and chill for 1-2 hours.
Whipped Cream
Beat heavy cream on high, gradually adding in sugar and vanilla until soft peaks form.
Spread or pipe prepared whipped cream over pie.
Garnish with curled chocolate and cover and chill until ready to serve.
Chocolate Curls
I went the easy route and made my chocolate curls by shaving off chocolate from a giant chocolate block with my potato peeler. I even had some chocolate shavers, but actually preferred the potato peeler curls to those.