Just before serving, stir in the shredded cheddar and Greek yogurt. With a potato masher or large spoon, mash half of the potatoes directly in the slow cooker. The soup will continue to thicken as it cools. If you would like the soup to be thinner, add the remaining 1 cup chicken broth until you reach your desired consistency (warm up the broth first). Stir to combine, then season with salt and pepper to taste. Serve hot, topped with bacon, chives, and additional cheese/Greek yogurt as desired.
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