Combine all ingredients except peas in the slow cooker. Stir to combine.
Cook on high for 4 hours.
After 4 hours, remove chicken and shred. Set aside.
Remove about 2 cups of the soup and blend until smooth and creamy. I try to get as much cauliflower and potato as possible as this really helps the soup have a creamy texture.
Return the pureed soup and shredded chicken to the slow cooker. Add peas. Stir to combine and continue to cook for an additional 15 minutes on high.