Add the broccoli, butter, onion, celery, garlic, salt, and pepper to the crock pot. Stir to combine.
In a separate bowl, whisk together the chicken broth and cornstarch until the cornstarch is completely dissolved. Pour into the crock pot and stir to combine.
Cover and cook on Low for 4–6 hours, or until the broccoli is tender.
Stir in the heavy whipping cream and shredded cheddar cheese. Cover and cook on High for about 30 minutes, or until the cheese is completely melted and the soup is creamy.
Stir well before serving and enjoy!
Video
Notes
Refrigerate the leftovers in an airtight container for up to 5 days.