One of the experimental ideas Pineapple had was to create a sweet potato pie-style ice cream. So we experimented a bit. She gave me a basic idea of what she wanted (sweet potato and cinnamon with the ice cream base) and I tried it out. The first iteration needed cinnamon. The next, needed something crunchy. Finally, it needed some salt and now we have a winner!
The cinnamon and sweet potato really shine in this ice cream. The salt helps keep the sweet potato lively. The texture of the ice cream is amazingly smooth and the mix-in helps you get the crunch that would normally come from the crust of an actual pie. The oat milk is also necessary to help bring in the pie crust flavor.
You will need to cook the sweet potato beforehand. The Ninja CREAMi is not intended to blend anything; a frozen, raw sweet potato will probably damage the machine and would likely give you a fibrous, stringy texture. Cooking the sweet potato in the sous vide will preserve the sweet potato flavor while softening the sweet potato and breaking down the fibers. You could try baking or boiling the sweet potato, but I cannot guarantee the results.