Place the seasoned chicken breasts at the bottom of the slow cooker, then layer on the chopped onion, minced garlic, diced carrots, and celery.
Pour the chicken broth over the ingredients, ensuring everything is submerged and covered.
Cover and cook on low for 6 to 7 hours, until the chicken is tender and shreds easily, filling your kitchen with warm, savory aromas.
Remove the cooked chicken breasts, shred them with two forks, then return the shredded meat to the slow cooker, stirring gently to combine.
Add the softened cream cheese to the soup, dolloping it in and stirring until it melts into a smooth, velvety base.
Sprinkle in the chopped fresh herbs, then cover the slow cooker again and cook on low for an additional 30 minutes, allowing the flavors to meld and the soup to thicken slightly.
Once bubbling and heated through, give the soup a good stir, taste for seasoning, and adjust with salt or herbs if needed.
Serve the creamy chicken soup hot, garnished with extra herbs if desired, and enjoy its rich, comforting texture and inviting aroma.