Heat a skillet over medium heat and cook the ground turkey with the diced onion and minced garlic until the turkey is no longer pink. Drain any excess liquid.
Transfer the turkey mixture to the slow cooker. Add the cubed potatoes, chicken broth, salt, and black pepper.
Cover and cook on low for 6 to 7 hours until the potatoes are very soft.
Stir in the heavy cream and let the soup warm for 10 more minutes.
Ladle into bowls and top each serving with shredded cheddar cheese, crumbled bacon, a dollop of sour cream, and chopped fresh chives.