INGREDIENTS
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1 stick butter
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1/2 onion, finely diced
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1 carrot, finely diced
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1 celery stalk, finely diced
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1 cauliflower head, cored and roughly chopped
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2 tablespoons finely minced fresh parsley
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8 cups low-sodium chicken broth or stock
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6 tablespoons all-purpose flour
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2 cups whole milk
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1 cup half-and-half
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1 to 2 teaspoons salt (or to taste)
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Ground black pepper
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1 heaping cup sour cream, at room temperature
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Warm rolls or crusty bread, for serving