Preheat the oven to 350°F (175°C).
Grease 4-6 ramekins with cooking spray or butter and place them in a baking dish.
In a large bowl, combine the pumpkin puree, granulated sugar, heavy cream, eggs, vanilla extract, cinnamon, and salt. Whisk until smooth.
Pour the pumpkin filling evenly into each ramekin, leaving a little space at the top.
Pour hot water into the baking dish until it reaches halfway up the sides of the ramekins. Bake for 25-30 minutes or until the edges are set but the center still has a slight jiggle.
Remove the ramekins from the water bath and let them cool to room temperature. Once cooled, refrigerate for at least 2 hours.
Before serving, sprinkle a thin layer of brown sugar on top of each custard. Use your kitchen torch to carefully caramelize the sugar until golden and bubbly.
Let them sit for a minute to cool slightly before serving to allow the sugar to harden.