Triple Chocolate Pumpkin Pie

Ingredients

• 2 cups graham cracker crumbs (about 16 crackers)
• 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
• 1/4 teaspoon ground ginger
• 3 ounces bittersweet chocolate (preferably 61 percent cacao), finely chopped
• 6 ounces semisweet chocolate (preferably 55 percent cacao), chopped
• 4 tablespoons unsalted butter, cut into small pieces
• 1 can (15 ounce) solid-pack pumpkin
• 1 can (12 ounce) 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
• 1 ounce milk chocolate, melted
• whipped cream, optional