INGREDIENTS
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2 tbsp. butter
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2 cloves garlic minced
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1 onion, diced
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2 tsp. fresh thyme
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Kosher salt
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Freshly ground black pepper
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1 c. heavy cream
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1/2 c. chicken stock
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1/4 c. chopped chives, plus more for garnish
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1 c. shredded fontina, divided
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3 to 4 Yukon gold potatoes, sliced thinly on mandolin