Add the oil to a dutch oven, or other large heavy bottomed pot, set over medium heat. When the oil is hot add the chicken and the Cajun seasoning, stirring to combine. Cook for 5 minutes, stirring occasionally.
2 tbsp olive oil, 1 lb boneless, skinless chicken breast, 3 tsp Cajun seasoning
Stir in the garlic and cook for another 60 seconds.
6 garlic cloves
Stir in the milk and broth, scraping up and browned bits or spices stuck to the bottom of the pan, until evenly incorporated.
1 1/2 cups chicken broth, 1 cup milk
Add the pasta to the pot, stirring as you do so it doesn't clump and stick together. Cover and bring to a boil, continuing to stir the mixture occasionally.
8 oz fettuccini pasta
Reduce the heat to medium low and let the pasta simmer, covered, for 9-11 minutes, stirring every 2-3 minutes to prevent sticking until most of the liquid has been absorbed.
Remove the pot from heat and stir in the cheese until melted and evenly incorporated.
1/3 cup grated Parmesan cheese
Season with salt & pepper, to taste, and serve immediately.
salt & pepper