2. In a large pot, add butter and reserved bacon fat. Heat over
medium heat. Add onion and cooke 3 minutes; sprinkle flour over
onion and cook 1 minute. Gradually whisk in milk; stir in salt,
pepper, nutmeg and cayenne. Add reserved mashed potatoes and
bring to a simmer. Reduce heat to medium-low and simmer 10
minutes, stirring occasionally. Stir in 2 cups of the cheese, half of
the reserved bacon and half the scallions.
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