Slow Cooker Version: In a large slow cooker, add chicken, onion, garlic, carrots, celery, potatoes, mushrooms, wild rice, water, thyme, salt, and pepper; cover and cook on Low for 8-10 hours or on High for 5-6 hours.Remove chicken onto plate and shred with 2 forks. To slow cooker, add milk, mustard and garlic powder; using an immersion blender give a few pulses until soup is desired thickness (don’t forget to stir and feel free to adjust thickness with extra water and spices). Add shredded chicken, parsley, stir and serve hot.Stovetop Version: In a large heavy bottom pot or Dutch oven, swirl a bit of avocado oil to coat; add onion, garlic, carrots, celery and fresh mushrooms (if using), and saute for 5 minutes. Add chicken, potatoes, wild mushrooms (if not using fresh), wild rice, water, thyme, salt, and pepper; bring to a boil, cover and cook on low heat with lid a bit open for about 45 minutes.Remove chicken onto plate and shred with 2 forks. To the pot, add milk, mustard and garlic powder; using an immersion blender give a few pulses until soup is desired thickness (don’t forget to stir and feel free to adjust thickness with extra water and spices). Add shredded chicken, parsley, stir and serve hot.