If you're craving a cozy bowl of Crockpot Broccoli Cheddar Soup, this recipe is about as easy as it gets. The slow cooker does all the work, leaving you with a rich, creamy soup that's perfect for busy weeknights, meal prep, or chilly afternoons.
Chop the onion and cut the broccoli into small florets. Add the broccoli, onion, shredded carrots, garlic, butter, paprika, cayenne, salt, and pepper to your slow cooker.
In a large bowl, whisk together the chicken stock, Dijon mustard, and cornstarch until the cornstarch is fully dissolved. Pour the mixture into the slow cooker and stir everything together.
Cover and cook on High for about 3½ hours, or until the vegetables are very tender.
Once the soup has finished cooking, use an immersion blender to blend it until mostly smooth, leaving a few broccoli pieces for texture. If you don't have an immersion blender, carefully transfer about half of the soup to a blender, blend until smooth, then stir it back into the slow cooker. Blend more or less depending on your preferred consistency.
Stir in the half and half and freshly grated cheddar cheese until the cheese has completely melted and the soup is smooth and creamy.
Serve warm with extra shredded cheddar cheese on top, if desired.