This was so easy, so yummy and so healthy to boot. Enjoy this.
1 lb skinless, boneless chicken breasts
1 large or 2 medium sized pars, cored and sliced thick
8-10 oz Portabella mushrooms, sliced thick
1/2 C balsamic vinegar
1 tsp salt
1/2 tsp black pepper
Place all ingredients in the cro k pot and let cook for about 4-6 hours on low, or until chicken falls apart easily.