INGREDIENTS
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8 tbsp. butter
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1 medium onion, chopped
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3 tbsp. all-purpose flour
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1 c. milk
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2 c. chicken stock
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kosher salt
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Freshly ground black pepper
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1 c. shredded cheddar, plus more for sprinkling
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1 c. shredded monterey jack, plus more for sprinkling
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2 lb. frozen hash browns, defrosted
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1 c. sour cream
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1 c. Cornflakes, crushed
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2 tsp. Chopped chives