Add the ground turkey to the slow cooker and break it into small pieces with a spoon.
Place the diced sweet potatoes, chopped onion, and minced garlic on top of the turkey.
Add the rinsed black beans and the can of diced tomatoes with their liquid.
Sprinkle in the chili powder and cumin, then pour the chicken broth over everything.
Season with salt and pepper, then stir gently to combine the ingredients.
Cover and cook on low for 6 to 7 hours until the sweet potatoes are soft and the turkey is fully cooked.
Stir once more before serving to check the seasoning.