In a slow cooker, combine the onion, carrots, celery, garlic, thyme, oregano, paprika, and black pepper. Pour in the chicken broth and stir to combine.
Cover and cook on low heat for 6-8 hours.
Add in the cooked chicken and cooked rice, stir to combine, and cook for an additional 30 minutes.
Stir in the fresh parsley and serve.
Interesting Facts
This soup is a great way to get in your daily servings of vegetables.
It's also a great way to use up leftover cooked chicken.