Steam or boil the sweet potato until tender, about 15 minutes. I normally boil a batch of them and use them in different dishes (e.g. Sweet Potato Bisque).
Mash the sweet potato and add the oats, almond milk and spices. Add some salt to taste.
Cook the oats over a media heat until the oats are tender or the way you like them. About 10 minutes.
Notes
You could add some sweetness but for most the sweet potatoes and the spices are already sweet enough.