Put water on to boil to cook your pasta, cook pasta while you are making the sauce.
Combine Cajun seasoning and flour in plastic bag and shake to combine.
Add chicken to bag (I buy the Perdue frozen chicken tenders for this) and shake to coat them. You may have to do several batches, and you'll want to set them aside on a plate.
In a large skillet over medium heat,melt the butter and add the chicken and saute for 5-7 minutes or until not pink anymore. Remove and keep warm.
Add the peppers, onions, and garlic to the pan. Saute until slightly soft - roughly 3 minutes.
Add the chicken back to the pan.
Reduce heat a little and add green onion, half and half, tomatoes, salt, basil, black pepper, and heat through.