INGREDIENTS

1 tablespoon butter
1/2 onion, chopped
1/4 cup melted butter
1/4 cup flour
2 cups milk
2 cups chicken stock
1 1/2 cups coarsely chopped broccoli florets
1 cup matchstick-cut carrots
1 stalk celery, thinly sliced
2 1/2 cups shredded sharp Cheddar cheese
salt and ground black pepper to taste
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