Dump all ingredients except spinach into crockpot and cook on high 6-8 hours.
The last 30 min. dump spinach in and stir into stew.
Notes
I put whole chicken breasts into the crockpot. After it has cooked for 6 hours the chicken just shreds easily with a fork when you stir. If you would like, you can cut your raw chicken into bite sized pieces and put in the the crockpot like that.