- 2 cups milk
- 2 cups chicken stock
- Melt 2 tablespoon butter in a skillet over medium-high heat. Saute onion in hot butter until translucent, about 5 minutes. Add broccoli, carrots and celery; simmer until vegetables are tender, about 20 minutes.Set aside.
- Whisk 1/4 cup melted butter and flour together in a large saucepan over medium-low heat; cook until flour loses it’s granular texture, adding 1 to 2 tablespoons of milk if necessary to keep the flour from burning, 3 to 4 minutes.
- Add chicken stock and then gradually pour milk into mixture while whisking constantly.
- Bring to a simmer; cook until flour taste is gone and mixture is thickened, about 20 minutes.
- Add the vegetables to the soup.
- Stir Cheddar cheese into vegetable mixture until cheese melts.
- Season with salt and pepper to taste.