INGREDIENTS
1 tbsp
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