In a large heavy-bottomed pot or Dutch oven, cook the ground turkey over medium-high heat until completely browned, breaking it apart with a wooden spoon.
Add the diced sweet potatoes, carrots, chili powder, and ground cumin to the pot. Sauté for 5 to 7 minutes until the vegetables begin to soften and the spices become fragrant.
Pour in the crushed tomatoes, chicken broth, kidney beans, and sweet corn. Stir thoroughly to combine all ingredients.
Bring the mixture to a gentle boil, then reduce the heat to low. Cover the pot and simmer the chili for 30 to 40 minutes, or until the sweet potatoes and carrots are perfectly fork-tender.
Ladle the hot stewed chili into bowls and garnish each serving with shredded cheddar cheese, a dollop of sour cream, and fresh green onions.