Season chicken with salt and black pepper and cook it in a pan for a few minutes.
Place the cooked chicken in the slow cooker.
In the same pan, sauté with Extra Virgin Olive Oil the red and green bell peppers (season with salt and pepper) and onion until golden brown. Add to the slow cooker.
Add all the rest of the ingredients listed above. Give it a quick stir and cover.
You can either set your crock pot to LOW 8 hours or HIGH 4 hours.
When the timer beeps, remove lid and keep the crock pot on HIGH one hour to help the sauce thicken if it is watery.
Serve with rice or pasta.