Set up a double broiler. Add the chopped chocolate to a metal or glass bowl. Once the chocolate has melted remove the bowl from the heat and set aside.
In a small saucepan combine the eggs and granulated sugar. Whisk until fully combined. Place over medium heat and cook, whisking constantly, until the temperature reaches 165°F and coats the back of a spoon. Remove from the heat and gently whisk in 1 teaspoon of vanilla extract and melted chocolate. Set aside to cool until warm.
In a mixing bowl, cream the butter until light and fluffy. Once the chocolate mixture has cooled to warm gradually add it to the butter and whip for 5 minutes on high.
In a clean mixing bowl, add 1 ⅓ cups of heavy cream and whip until peaks form. Then, fold the whipped cream into the chocolate mixture until it is fully incorporated, ensuring no white streaks remain.
Transfer the mixture into the pie crust, ensuring it's spread evenly, and then chill in the refrigerator for a minimum of six hours.
After the pie has fully set add the remaining 1 cup of heavy cream to a mixing bowl and whip until slightly thickened. Add in the powdered sugar and remaining ½ teaspoon of vanilla extract. Continue whipping until peaks form. Spread evenly over the set pie. Garnish with chocolate curls if desired. Enjoy!