Combine potatoes, chicken broth, onion, butter, salt, and pepper in a slow cooker (such as Crock Pot®). Cook on High until soup flavors meld and potatoes are extremely soft, 4 to 5 hours.
Stir bacon, half-and-half, Cheddar cheese, and sour cream into the soup. Turn heat to Low setting; cook until thick and creamy, 15 to 20 minutes more.
Mash the soup in the slow cooker using a potato masher to your desired consistency. Garnish with additional Cheddar cheese, sour cream, and chives.
You can use white or yellow onions.
Margarine can be substituted for the butter.
Light sour cream can be substituted for the full-fat version.
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