Heat a large pot or dutch oven over medium high heat, then add the oil. Once it is hot, add the onion and saute until it is translucent, about 3-4 minutes.
1 tablespoon olive oil, ½ medium onion
Add the minced garlic, cajun seasoning, dried thyme, kosher salt, and pepper.. Cook for 30 seconds, stirring constantly.
1 tablespoon garlic, 2 teaspoon cajun seasoning , 1 teaspoon dried thyme, 1 teaspoon kosher salt, ½ teaspoon ground pepper
Pour in the crushed tomatoes and cook the mixture for another 30 seconds, stirring well.
1 (28 ounce) can crushed tomatoes
Add the chicken broth, heavy cream, and uncooked pasta. Turn the heat to high and bring to a boil. Once it is boiling, cover the pot and reduce the heat until it is simmering (for my oven that is low heat, but your burner may be a bit different). Simmer for 15 minutes.
4 cups chicken broth, ½ cup heavy cream, 1 lb tubular pasta
After 15 minutes, remove the lid and add the chicken. Stir well and continue simmering uncovered for about 5 minutes, until the chicken is warmed through and the pasta is al dente (tender but with a slight chewiness).
3 cups rotisserie chicken
Remove the pot from the stove and add the parmesan cheese to taste (I go for the whole 1 cup, but use as much as you like for flavor). The sauce may be a little loose at this point, but it will thicken up as it cools. Serve warm with extra parm or fresh thyme on top.
½ - 1 cup parmesan cheese