Put your drained tomatoes with green chilies in your crockpot. Top with chicken breasts and seasoning. Turn on low and cook for 3 hours.
After the hours are over, add the bell peppers and onion to the crockpot. Cook another 3-5 hours.
Remove chicken from crockpot and allow to cool. Carefully slice into strips.
Add the sliced chicken back to crockpot and stir.
Serve the hot chicken in whatever fuel setting you want.