INGREDIENTS
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2 tbsp unsalted butter
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3 cups leeks, chopped (white and light green parts only)
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1 tsp garlic, chopped
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2 cups yellow-fleshed potatoes, peeled and chopped
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6 cups low-sodium vegetable or chicken stock
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4 cups packed baby spinach
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1/4 cup plain yogurt
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1 tbsp chives, chopped
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