Ingredients

• 6 tablespoons unsalted butter
• 1/4 cup (packed) light brown sugar
• 1/3 cup black sesame seeds
• 5 ounces chocolate wafer cookies (about 23), broken into small pieces
• Pinch of kosher salt
• 2 small sweet potatoes (about 1 pound)
• 1/2 cup (packed) light brown sugar
• 3 tablespoons unsalted butter, melted
• 2 tablespoons white miso
• 2 large egg yolks
• 1 large egg
• 1 cup heavy cream
• Whipped cream or vanilla ice cream (for serving)
• A spice mill or a mortar and pestle

Instructions

1. Heat butter and brown sugar in a small saucepan, stirring to dissolve sugar, until butter is melted.
2. Meanwhile, very finely grind sesame seeds in spice mill or with mortar and pestle. Pulse cookies in a food processor until finely ground.
3. Pour butter mixture into food processor; add salt and ground sesame and pulse to combine. Using a measuring cup, press cookie mixture firmly onto bottom and up the sides of a 9" pie dish. Freeze until very cold, 20–25 minutes.
4. Preheat oven to 350°F. Bake crust until firm and slightly darkened in color, 15–18 minutes. If crust slides down sides, gently press back up. Let cool.
5. Filling: Preheat oven to 350°F. Roast sweet potatoes on a foil-lined rimmed baking sheet until tender, 50–60 minutes. Slice open lengthwise and let cool. Scoop out flesh from skins (you should have about 1 cup); pulse in food processor until very smooth. Discard skins. Whisk brown sugar, butter, and miso in a medium bowl until smooth. Add egg yolks and egg and whisk just to incorporate. Whisk in sweet potato purée, then cream. Reduce oven temperature to 300°F. Pour filling into crust. Bake pie, rotating halfway through, until filling is set (it will still wobble slightly in the very center), 50–60 minutes. Transfer dish to a wire rack and let pie cool before slicing, about 2 hours. Serve pie topped with whipped cream or scoops of vanilla ice cream.
6. Preheat oven to 350°F. Roast sweet potatoes on a foil-lined rimmed baking sheet until tender, 50–60 minutes. Slice open lengthwise and let cool. Scoop out flesh from skins (you should have about 1 cup); pulse in food processor until very smooth. Discard skins.
7. Whisk brown sugar, butter, and miso in a medium bowl until smooth. Add egg yolks and egg and whisk just to incorporate. Whisk in sweet potato purée, then cream.
8. Reduce oven temperature to 300°F. Pour filling into crust. Bake pie, rotating halfway through, until filling is set (it will still wobble slightly in the very center), 50–60 minutes. Transfer dish to a wire rack and let pie cool before slicing, about 2 hours.
9. Serve pie topped with whipped cream or scoops of vanilla ice cream.