Scrub sweet potatoes, and poke each of them a few times with a fork. Bake on a rimmed baking sheet at 400 for 50-60 minutes, or until tender.
Start prepping the turkey taco filling when your sweet potatoes have about 20 minutes left to bake: Brown ground turkey, onion, and garlic in a large skillet over medium-high heat, breaking up as you go, then drain.
Return the meat to the skillet and reduce heat to medium-low. Stir in the tomato sauce, black beans, and spices, then continue simmering, stirring occasionally, until flavors are well-blended and beans are heated through.
Slice open each baked sweet potato and mash the inside a bit with a fork, scooping some of the middle over to the sides to create a well for the turkey taco filling.
Fill each sweet potato with the seasoned ground turkey & black bean mixture, then top each with shredded cheddar cheese. Return the baking sheet to the oven and broil on high for about three minutes, or until cheese is nicely melted.
Serve with your favorite taco toppings.
Notes
To save time on a busy weeknight, you can do a little meal prep by baking the sweet potatoes ahead of time and then simply reheat them while you're preparing the turkey taco filling.