Bring a large pot of salted water to a boil and cook pasta according to package directions. 8 - 10 min.
Dice chicken into cubes and place in a plastic bag with 2 tsp of the Cajun seasoning and toss to coat.
In a large skillet over medium heat saute the chicken in melted butter until almost tender ( 5-7 min).
Add the sliced red and yellow peppers and onion and saute another 3-4 minutes and reduce heat.
Add cream, basil, lemon pepper, 1-2 tsp Cajun seasoning, salt, garlic powder and pepper. Heat through.
Turn off heat and add ¼ c of the Parmesan cheese and stir until melted.
Add the pasta and stir to coat.
Sprinkle with more Parmesan cheese and parsley for garnish.