Preheat the oven to 350°F (175°C) and prepare a baking dish with hot water for a steam bath.
In a large mixing bowl, whisk together pumpkin puree, brown sugar, and eggs until smooth. Stir in heavy cream, bourbon, and spices.
Pour the mixture evenly into ramekins, filling them about 3/4 full.
Bake for 25-30 minutes until edges are set, and centers have a slight jiggle.
Remove and cool slightly before chilling in the refrigerator for at least 2 hours or overnight.
Sprinkle superfine sugar on top and caramelize using a kitchen torch or broiler.
Whip heavy cream and bourbon until soft peaks form, then sweeten to taste.
Serve topped with bourbon vanilla whipped cream.