Preheat your oven to 350°F (175°C).
Fit the pre-made pie crust into the pie pan according to package instructions. Prick the bottom and sides with a fork to prevent bubbling.
In a large mixing bowl, combine the pumpkin puree, brown sugar, granulated sugar, and eggs. Whisk until smooth.
Add the heavy cream, milk, bourbon, vanilla extract, cinnamon, nutmeg, ginger, and salt to the mixture. Use the whisk or electric mixer to blend until fully combined and smooth.
Pour the pumpkin mixture into the prepared pie crust, smoothing the top with a rubber spatula.
Bake in the preheated oven for 50-60 minutes or until the filling is set and a knife inserted in the center comes out clean.
Once done, remove the pie from the oven and let it cool to room temperature for about 20 minutes.
Once cooled, refrigerate the pie for at least 2 hours, or until thoroughly chilled.
Before serving, sprinkle an even layer of granulated sugar over the top of the pie. Using a kitchen torch, carefully melt the sugar until it's golden and caramelized, creating a crispy brûlée layer.
Allow the brûlée topping to cool briefly before slicing and serving.