Cook pasta according to package directions.
Meanwhile, toss chicken with 2 teaspoons of Cajun seasoning.
In a large skillet, heat 2 tsp of olive oil. Cook chicken until fully cooked. Remove and keep warm
In the same skillet, saute peppers and onion in remaining 1 tsp of oil for 1 minute. Add garlic. Saute 1 minute longer. Add tomatoes; saute 2 minutes longer. Stir in 3/4 cup half and half.
Bring to a boil. Combine cornstarch with remaining Cajun seasoning and remaining half and half until smooth; gradually stir into skillet. Cook for 1-2 minutes or until thickened. Return chicken to the pan, heat through. Drain pasta; toss with chicken mixture
