INGREDIENTS
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3 tbsp. unsalted butter
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1 medium onion
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1 c. whole milk
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1/2 c. heavy cream
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Kosher salt
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pepper
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8 oz. cream cheese
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3 oz. Parmesan
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1/4 c. chopped fresh flat-leaf parsley
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1 tbsp. fresh thyme
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3 lb. russet potatoes
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chopped fresh chives