Stir cauliflower, potatoes, carrots, and onion flakes together in a pot; add enough water to cover and stir in chicken bouillon cube. Bring to a simmer and cook until cauliflower is tender, about 10 minutes.
Transfer vegetable mixture and about 1 cup cooking liquid to a slow cooker. Stir cream of chicken soup, milk, cream cheese, and bacon bits into vegetable mixture.
Cook on Low, stirring occasionally, for 2 1/2 hours.
Stir parsley into soup and continue cooking until vegetable are tender and flavors blend, 1/2 to 1 1/2 hours. Top with shredded Cheddar cheese.
The nutrition data for this recipe includes the full amount of the chicken broth. The actual amount of the broth consumed will vary.
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