Whip the powdered sugar, butter and vanilla together for 5 minutes. Melt 2 squares of bitter chocolate and add to the sugar butter mixture and beat for 5 minutes. Add 4 eggs, one at a time, beat for 5 minutes after each addition. After adding the last egg, beat for 8 minutes. Pour into a baked pie shell and refridgerate. Top with whipped cream.

Note this does contain raw eggs and MUST be refrigerated. Please be careful with food safety. This pie is intended to be eaten quickly.