01 - Preheat oven to 350°F. Lightly grease a 2-quart baking dish or six 6-oz ramekins with cooking spray or butter.
02 - In a large mixing bowl, whisk together pumpkin puree, whole milk, eggs, heavy cream, brown sugar, granulated sugar, and vanilla extract until completely smooth and no lumps remain.
03 - Add pumpkin pie spice, ground cinnamon, and sea salt to the mixture. Whisk vigorously until all spices are fully distributed throughout the batter.
04 - Pour the spiced pumpkin mixture into the prepared baking dish, or divide evenly among the six greased ramekins if making individual servings.
05 - Place the baking dish or ramekins inside a larger roasting pan. Carefully pour hot water into the roasting pan until it reaches halfway up the sides of the inner container to create a gentle bain-marie.
06 - Bake for 40 to 45 minutes. The pudding is done when the edges are set but the center still retains a slight wobble when gently shaken—similar to cheesecake texture.
07 - Remove from oven and carefully lift the pudding dish out of the hot water bath. Let cool for at least 15 minutes before serving warm, or refrigerate for 2 hours to serve chilled.