Place the sweet potatoes on a lightly greased baking tray and bake for 55-65 minutes or until a fork can easily be inserted into the flesh of the potatoes.
When the sweet potatoes have about 10 minutes left, heat the oil in a skillet over medium heat and then add in onion. Saute for 5 minutes until the onion begins to become translucent. Add in the spices stir and cook for an additional 3 minutes.
Add the black beans to the skillet and toss to combine. Continue to cook, stirring frequently, until the black beans are fully heated through. About 5 minutes. Take off of heat and set aside.