Add the diced tomatoes, tomato paste, chicken, broth, garlic, salt, pepper, Italian seasoning, onion, mushrooms, and bell pepper to the slow cooker. Stir. Nestle in the chicken thighs into the sauce.
Cover and cook on HIGH for 4 hours, or on LOW for 7. Try not to open the lid during the cooking time.
Serve over rice and enjoy!
Notes
You can add red wine such as cabernet or red blend to crock pot chicken cacciatore. Only add two tablespoons of wine for the slow cooker doesn't cook it off all the way, and it can be strong if you add any more.
Like thick chicken cacciatore? Make a cornstarch slurry with 2 tablespoons of cold water and 2 tablespoons of cornstarch. Add to the finished dish and continue cooking for 20 minutes more.
For a spicy kick, add a generous pinch of red pepper flakes at the beginning of the cooking time.