Loaded Baked Potato Soup

slices bacon, divided

russet potatoes, peeled and cubed

unsalted butter

small clove garlic, finely minced

green onions, thinly sliced

all-purpose flour

milk, or more, as needed

chicken broth (no salt added preferred)

cheddar cheese, shredded

sour cream

Kosher salt and freshly ground black pepper,

Additional green onion, cheese and bacon for garnish (Optional)