STEP 1

To a 6-8 quart slow cooker, add the onion, broccoli, carrots, celery, salt, pepper, and chicken stock.

STEP 2

Cover and cook on LOW for 5 hours. Melt the butter and then whisk in the flour. Pour mixture into the slow cooker.

STEP 3

Stir in the milk and shredded cheese. Replace cover and cook another hour.

STEP 4

Stir until smooth and then serve!