Triple-Chocolate Pumpkin Pie

INGREDIENTS

• Crust:
• 2 cups finely ground graham cracker crumbs (about 16 crackers)
• 3 ounces (6 tablespoons) unsalted butter, melted
• 1 tablespoon granulated sugar
• 2 tablespoons packed light-brown sugar
• 1/2 teaspoon coarse salt
• 1/2 teaspoon ground cinnamon
• 3 ounces bittersweet chocolate (preferably 61 percent cacao), finely chopped
• Filling:
• 6 ounces semisweet chocolate (preferably 55 percent cacao), chopped
• 2 ounces (4 tablespoons) unsalted butter, cut into small pieces
• 1 can (15 ounces) solid-pack pumpkin
• 1 can (12 ounces) evaporated milk
• 3/4 cup packed light-brown sugar
• 3 large eggs
• 1 tablespoon cornstarch
• 1 teaspoon pure vanilla extract
• 1 1/2 teaspoons coarse salt
• 3/4 teaspoon ground cinnamon
• 3/4 teaspoon ground ginger
• 1/4 teaspoon ground nutmeg
• 1/8 teaspoon ground cloves
• Topping:
• 1 ounce milk chocolate, melted
• whipped cream, optional