01 - Preheat oven to 350°F. Lightly grease a 2-quart baking dish or six 6-oz ramekins with butter or cooking spray.
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 well combined.
03 - Add pumpkin pie spice, cinnamon, and salt to the mixture. Whisk thoroughly until all dry ingredients are fully incorporated and no lumps remain.
04 - Pour the batter into the prepared baking dish or divide evenly among the ramekins, filling each about 3/4 full.
05 - Place the baking dish or ramekins in a larger roasting pan. Carefully pour hot water into the roasting pan until it reaches halfway up the sides of the inner dish to create a gentle water bath.
06 - Bake for 40-45 minutes until the pudding is set around the edges but still retains a slight wobble in the center when gently shaken.
07 - Remove from oven and carefully lift the dish out of the water bath. Let cool for at least 15 minutes before serving warm, or refrigerate for at least 2 hours for a chilled dessert.