As potatoes cool prepare soup by melting butter in a large saucepan, and saute onion until light brown. Add the flour to the onions and stir to make a roux. Add stock, water, cornstarch, mashed potatoes, and spice to the pot and bring to a boil. Reduce heat and simmer for 5 minutes.
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Add chopped backed potato and half-and-half to the saucepan, bring soup back to a boil, then reduce heat and simmer the soup for another 15 minutes or until it is thick. Spoon about 1 1/2 cups of soup into a bowl and top with about a tablespoon of shredded cheddar cheese, a half tablespoon of crumble bacon and a taspoon or so of chopped green onion. Repeat for remaining servings.
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