Add the heavy cream to a medium bowl and set aside. In another medium bowl, add the egg yolks.
In a medium pot, add the whole milk, sugar, and salt. Heat until the sugar and salt have dissolved. It can take about 3 minutes.
Take the warmed milk mixture and very slowly whisk in about ½ cup into the egg yolks. Then pour the egg mixture back into the pot and cook until the mixture has thickened or covered the back of a spoon. It can take about 13-15 minutes.
Using a mesh strainer, pour the milk and egg mixture into the bowl with the heavy cream. Stir to combine. Then put the mixture in an ice bath to help cool it down. Once the mixture is cooled, put it in an airtight container and refrigerate for at least 2-3 hours.
Churn the ice cream mixture using your ice cream machine’s instructions. While it’s churning, you want to cut small pieces of the sweet potato pie and set them aside. When you have 5 minutes left, add the pie pieces and combine. Freeze the ice cream for at least 4 hours to overnight.
Serve ice cream in a cone, and using an offset spatula sprayed with cooking spray, spread some of the marshmallow fluff on top. Using a kitchen torch, toast the fluff and enjoy!