INGREDIENTS
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2 teaspoons olive oil
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1 cup diced onion
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1 cup diced celery
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6 cups reduced-sodium chicken or vegetable broth
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2 cups mashed potatoes
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8 ounces shredded Cheddar
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1/2 teaspoon salt
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1/4 teaspoon ground white pepper
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1 teaspoon dry mustard
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Hot sauce, optional