Pumpkin-Mousse Pie

INGREDIENTS

• 9 ounces graham crackers
• 1/3 cup plus 2 tablespoons plus 3/4 cup granulated sugar
• 3 tablespoons Dutch-process cocoa powder
• 3/4 teaspoon ground cinnamon, plus 1 tablespoon for dusting
• 1/4 teaspoon plus a pinch ground nutmeg
• 12 tablespoons (1 1/2 sticks) unsalted butter, melted
• 1/4 cup brandy
• 2 tablespoons unflavored powdered gelatin
• 3 large eggs, room temperature
• 1 1/2 cups homemade , or canned Pumpkin Puree
• 1/4 teaspoon ground allspice
• 1/4 teaspoon ground ginger
• 1/2 teaspoon salt
• 1/4 cup sour cream
• 1 1/2 cups heavy cream
• 2 tablespoons confectioners’ sugar
• 1/2 teaspoon pure vanilla extract