S'mores Sweet Potato Pie Recipe

Ingredients

• 2 cups graham cracker crumbs
• 2 tablespoons granulated sugar (optional)
• 1/2 cup unsalted butter, melted
• 1 (15-ounce) can sweet potato purée
• 2 eggs, plus 1 egg yolk, room temperature
• 1¼ cups dark brown sugar
• 1 teaspoon vanilla extract
• 1 tablespoon cornstarch
• 2 teaspoons ground cinnamon
• 3/4 teaspoon kosher salt
• 1/2 teaspoon ground ginger
• 1/4 teaspoon ground cloves
• 1 cup heavy cream
• 1/4 cup whole milk
• 1 cup chocolate chips
• 5 to 6 tablespoons heavy whipping cream
• large marshmallows, for garnish