Heat the oil in a large pot over medium high heat. Add the chicken and season with 1 teaspoon cajun seasoning. Cook until the chicken is cooked throughout and no longer pink in the center. Add the garlic and continue cooking for 1 minute.
Add the broth, half and half, 1 teaspoon cajun seasoning, salt, pepper, and garlic powder to the pot. Break the fettuccine noodles in half and add them to the pot.
Cover and bring to a rapid boil. Reduce heat to medium low and continue to cook for 10-12 minutes or until the noodles are al dente and there is only about 1/4 inch of liquid along the bottom.
Remove from heat and stir in the parmesan cheese. Serve immediately.