INGREDIENTS
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2 lbs medium potatoes (red, Yukon gold, russet), peeled
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2 tbsp unsalted butter
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1/2 cup chopped onion
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3 tbsp all-purpose flour
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2 cups milk
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1 tsp dry mustard
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pinch of cayenne pepper
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pinch of smoked paprika
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1/2 tsp salt
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2 cups cheddar cheese, divided
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1 tbsp chopped fresh parsley, optional