"This is a sophisticated version of a family favorite...."
INGREDIENTS
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1 pound dry macaroni
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2 teaspoons olive oil
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2 shallot, minced
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2 cups half and half
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1/2 cup heavy cream
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2 tablespoons butter
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21/2 tablespoons flour
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1 egg beaten
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2 teaspoons kosher salt
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5 cups grated New York cheddar cheese
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(about 11/4 pounds), divided
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3 tablespoons chives, finely minced