chocolate pudding pie

INGREDIENTS

• 1/4 cup cornstarch
• 1/3 cup plus 2 tablespoons sugar, divided
• 3 tablespoons unsweetened cocoa powder
• 1/4 teaspoon salt
• 3 cups whole milk
• 4 ounces bittersweet chocolate (not more than 60% cacao), finely chopped
• 1 teaspoon pure vanilla extract
• 1 cup chilled heavy cream