Add chicken, broth, and seasonings to crockpot; cook on high 3–4 hrs or low 6–8 hrs.
Cook rice and set aside.
Blend sauce ingredients with a little broth until smooth.
Shred chicken, then stir in sauce, parmesan, and spinach; cook 5–10 minutes until thickened.
Divide into 8 servings with rice and store or serve.
