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Preheat oven to 350°F. Brush Grilled & Ready Chicken Breast Fillets with oil and sprinkle with 1 tablespoon of the Cajun seasoning; set aside.
Cook pasta according to package directions.
In a large saucepan melt butter over medium heat. Stir in flour, remaining 1 tablespoon Cajun seasoning, salt, and pepper. Stir in milk. Cook and stir over medium heat until thicken and bubbly. Cook and stir 1 minute more. Reduce heat to low. Add the 1-1/2 cups cheese; stir until cheese melts.
Add cooked pasta and sweet pepper stir-fry to sauce; stir to combine. Transfer to a greased 3-quart rectangular baking dish. Top with reserved chicken.
Bake, covered, for 25 minutes. Uncover and sprinkle with remaining 1/2 cup cheese. Bake 5 minutes more or until cheese is melted.