Preheat your oven to 350°F (175°C).
Prepare the pie crust by fitting it into a pie pan or making homemade crust, baking until lightly golden.
In a mixing bowl, combine pumpkin puree, heavy cream, egg yolks, sugar, vanilla extract, and cinnamon until smooth.
Pour the filling into the pre-baked pie crust, spreading evenly.
Bake for 40-45 minutes until the filling is set but slightly jiggly in the center.
Cool for 30 minutes, then chill in the refrigerator for at least four hours.
Sprinkle granulated sugar evenly over the pie.
Using a kitchen torch, caramelize the sugar until golden brown.
Allow the sugar to harden before slicing and serve.