INGREDIENTS
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1/2 lb (8 oz) elbow macaroni
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2 Tbsp salted butter
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2 Tbsp all-purpose flour
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1 1/2 cups whole milk
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2 cups shredded sharp cheddar cheese, divided
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2 oz cream cheese
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1/2 tsp kosher salt
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1/4 tsp ground black pepper
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1 egg, beaten