Melt butter in a large sauté pan over medium heat.
Once melted, add in onion, celery, mushrooms, and garlic and cook for 10 minutes, stirring occasionally. Set aside.
In a small bowl, whisk together rosemary, sage, thyme, salt, pepper, and nutmeg. Set aside.
In a medium sized bowl, whisk together condensed soup, sour cream, and milk until smooth. Set aside.
Grease a 6 quart crockpot with cooking spray, then add in chicken breasts.
Sprinkle chicken with 1/2 the spice mixture, then top with the sautéed veggies, cranberries, and chicken broth.
Cover with the stuffing mix, then pour on the soup/sour cream/milk mixture.
Place frozen green beans on top and sprinkle with remaining spice mixture.
Cover and cook on HIGH for 4 hours (preferred) or on LOW for 8 hours.
Remove chicken, shred, then stir back into the crockpot*.
Taste and re-season, if necessary, then serve with optional fried onions and enjoy!
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