Season the chicken with Italian seasoning, oregano, garlic, and some pepper.
Lightly spray the bowl of the slow cooker with non stick cooking spray, and then place the seasoned chicken breasts in the bottom of it.
Add the potatoes, onion, carrots, and celery around the chicken. Stir gently, if needed, to mix them together a bit.
In a separate mixing bowl add the milk, bouillon, sour cream, cream of soups, and broth. Whisk everything together until the mixture's evenly combined. Pour this mixture evenly out over top of the chicken & veggies.
Cover & cook on low for 8 hours, or until the potatoes are fork tender. The chicken should be ready to fall apart, break it up into small pieces with the back of a sturdy wooden spoon.
Stir in the peas, warmed cream, and seasoned salt. Taste and adjust seasonings, if needed.
Ladle the soup in to bowls, and serve hot with crusty bread or crackers.