Spray your crockpot with cooking spray. Pour in the potatoes, chicken stock, water, celery, and diced onion. Cook on low for 6-8 hours. One hour prior to servig- In a small bowl, mix together the flour and milk. Whisk until blended and then add to the crockpot and stir. Change the crockpot temperature to high anf let it thicken for 20-30 minutes. It will look cloudy. After the 20-30 minute period, soup should be getting thicker. Return temperature setting to low. Add the bag of cheddar cheese and stir into the pot. Let it cook an addition 20 minutes. Cheese will melt and soup will continue to thicken.
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