INGREDIENTS
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1/4 c. butter
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1 onion, chopped
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1/4 c. all-purpose flour
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2 c. low-sodium chicken broth
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kosher salt
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Freshly ground black pepper
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1 large head broccoli, finely chopped
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1 large carrot, cut into matchsticks
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2 stalks celery, thinly sliced
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2 c. whole milk
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3 c. shredded Cheddar, plus more for garnish
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Baguette, for serving