Momofuku Milk Bar Crack Pie

room temperature unsalted butter (divided (6 tablespoons))

light brown sugar (divided (3 tablespoons))

granulated sugar ((1½ tablespoons))

egg yolk

all-purpose flour ((¼ cup))

old-fashioned rolled oats ((¾ cup))

.25 baking powder (scant pinch)

.25 baking soda (scant pinch)

kosher salt (divided (½ teaspoon))

granulated sugar ((¾ cup))

light brown sugar ((¼ cup + 2 tablespoons))

milk powder ((2 tablespoons))

corn powder ((2 tablespoons) optional)

kosher salt ((¾ teaspoon))

unsalted butter, melted ((8 tablespoons, 1 stick))

heavy cream ((¼ cup + 2 tablespoons))

vanilla extract ((½ teaspoon))

egg yolks

confectioners’ sugar for dusting