Preheat oven to 425°F.
Prep the sweetpotatoes: Wash the sweetpotatoes and cut them in half lengthwise. Brush the flesh of each sweetpotato with olive oil (use about 1 tablespoon total) and then place them flesh-side down on a baking sheet. Bake for 25-30 minutes, or until the sweetpotatoes are tender and golden.
Cook the filling: While the sweetpotatoes are baking, heat the remaining 1 tablespoon of olive oil in a skillet over medium heat. Add the ground turkey or chicken and cook for 8 minutes, until cooked through. Stir in the black beans, taco seasoning, and water. Cook for another 5 minutes, stirring occasionally, until the beans are heated.
Assemble the tacos: Once the sweetpotatoes are done, remove them from the oven, and use a spatula to flip each one. Then use a fork to gently smash the flesh-side of each half and top with the taco filling, cheese, coleslaw mix, cilantro, avocado, and a squeeze of lime.