One Thanksgiving, I asked my son-in-law, who was visiting with our daughter and her family, to make the mashed potatoes. I neglected to say how much, and he peeled and cooked an entire 10-pound bag of Idaho russets. After they left, we had about six cups of leftover mashed potatoes. I like potato soup and thought I could turn the leftover mashed potatoes into soup. Hence, the birth of this leftover mashed potato soup recipe.
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