Preheat your oven to 325°F (160°C) and place 4 ramekins in a baking dish.
In a medium saucepan, combine the heavy cream, whole milk, and pumpkin puree. Heat over medium heat until steaming but not boiling, stirring frequently.
In a separate bowl, whisk together the egg yolks, sugar, cinnamon, nutmeg, ginger, and salt until smooth.
Slowly pour the warm pumpkin mixture into the bowl with the egg yolk mixture, whisking continuously to temper the eggs.
Strain the mixture through a fine sieve to remove any lumps, then evenly distribute the mixture into the ramekins.
Fill the baking dish with hot water until it reaches halfway up the sides of the ramekins.
Carefully place the baking dish in the oven and bake for 30-35 minutes, or until the centers are just set but still slightly wobbly.
Remove the ramekins from the water bath and let them cool to room temperature, then refrigerate for at least 2 hours.
Before serving, top each pot de crème with a dollop of whipped cream and sprinkle with crushed gingersnap cookies for added crunch and flavor.