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Wash potatoes really well and dry with a paper towel. Wrap each potato in foil and place on baking sheet.
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Bake potatoes in a 400 deg oven for about an hour or until done.
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Allow potatoes to cool then peel and mash them, leaving some lumps.
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Mix together milk and flour in a large pan and whisk until combined.
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Cook over low to med heat until it begins to thicken.
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Add mashed potatoes, 1/2 cup cheese,salt and pepper to your taste, and stir until cheese melts.
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Remove from the heat and stir in sour cream and 3/4 cup scallions.
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Top each bowl of soup with remaining cheese, scallions and bacon.