INGREDIENTS
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1 tablespoon unsalted butter
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1 tablespoon olive oil
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1 medium onion, chopped
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2 cloves garlic, minced
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1 large head cauliflower, coarsely chopped
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4 cups low-sodium chicken broth
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Salt and pepper
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1 cup whole milk
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1 teaspoon Dijon mustard
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1 1/2 cups shredded sharp or extra sharp white Cheddar
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Croutons, for serving, optional