Bake sweet potatoes on 425 degrees F for 1 hour - 1 hour 30 minutes, depending on size.
While potatoes are baking, season chicken with olive oil, sea salt and spices.
Remove potatoes from oven, and allow to cool enough to handle.
Add onions and peppers, along with the chicken, to the broiler tray, and bake on 425 degrees F for 15 minutes.
Slice sweet potatoes down the center, and then remove half of the flesh from the insides. Add the sweet potato to a bowl.
Add roasted chicken and veggies, along with lime juice and cheese, to the sweet potato puree, and mix well to combine.
Divide the filling back into the 4 sweet potatoes. Top potatoes with additional cheese, if desired.
Return sweet potatoes to the oven for another 15 minutes, until cheese starts to brown.
Top sweet potatoes with avocado, cilantro, or salsa to serve.