INGREDIENTS
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1/2 cup unsalted butter
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1 medium onion, thinly sliced
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3 leeks, sliced
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3 large baking potatoes, peeled and cut into 1/4-inch-thick slices
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3 (14 1/2-ounce) cans chicken broth
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1 teaspoon salt
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1/4 teaspoon pepper
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Toppings: shredded Cheddar cheese, crumbled cooked bacon, chopped fresh chives