Place chopped chicken and cajun seasoning in a bowl and toss until evenly coated.
In a large skillet over medium heat, sautée chicken in butter until tender. (Make sure chicken is 'flaky' all the way through).
Reduce heat and add heavy cream, green onion, tomatoes, basil, salt, garlic powder, and half of the parmesan cheese. Bring heat back to medium to a slight simmer and heat through until sauce begins to thicken.
Gently mix in cooked pasta and stir in remaining parmesan cheese. Alternatively you can pour the mixture over plated noodles.