Add the broccoli florets, cauliflower florets, diced potatoes, chopped onion, vegetable broth, garlic powder, salt, and black pepper to the slow cooker.
Cover and cook on low for 6 hours until the vegetables are soft.
Stir in the shredded cheddar cheese and milk. Continue cooking for 20 to 30 minutes until the cheese melts fully and the soup thickens slightly.
Ladle into bowls and serve.
Notes
Mash a few potato pieces with a fork right before stirring in the cheese if you want a thicker consistency. Leftovers store in the fridge for up to three days and reheat best on the stovetop with a little extra milk to restore creaminess. Use sharp cheddar for stronger flavor or swap in half the milk for cream if you prefer a richer result.Course: Soup
Cuisine: American
Equipment: Slow Cooker