Preheat your oven to 400°F.
Wash the sweet potato thoroughly, pierce it with a fork a few times, and place it on a baking sheet. Bake for 45-50 minutes or until tender.
While the sweet potato is baking, finely chop the small onion and mince the garlic cloves.
In a non-stick pan over medium heat, sauté the onion and garlic until translucent, about 3-4 minutes.
Add the lean ground turkey to the pan and cook until it is browned and cooked through, breaking it up with a spoon as it cooks.
Stir in the diced tomatoes, chili powder, cumin, and season with salt and pepper. Allow the mixture to simmer for 5-7 minutes so the flavors meld.
Once the sweet potato is tender, remove it from the oven and carefully slice it open lengthwise, fluffing the inside with a fork.
Spoon a generous amount of the turkey chili mixture into the sweet potato.
Top with the shredded or sliced cheddar cheese, and if desired, return to the oven for 2-3 minutes until the cheese is melted.
Serve warm and enjoy your nutritious, protein-rich meal.