Bring a large pot of salted water to a boil. Add the fettuccine pasta and cook according to package instructions, usually around 10-12 minutes, until al dente. Drain the pasta, reserving about ½ cup of pasta water for later use. Set aside.
Heat 1 tablespoon of olive oil in a large skillet over medium-high heat. Add the sliced turkey sausage and cook until browned and cooked through, about 5-7 minutes. Remove the sausage from the pan and set aside.
In the same skillet, add the chopped onion and bell pepper. Sauté for 4-5 minutes until softened and fragrant. Add the minced garlic and cook for another minute, stirring to avoid burning.
Lower the heat to medium. Pour in the heavy cream and chicken broth, stirring to combine. Sprinkle in the Cajun seasoning, salt, and pepper. Let the sauce simmer gently for 3-4 minutes, allowing it to thicken slightly.
Return the cooked sausage to the skillet, then add the halved cherry tomatoes. Stir everything together and simmer for another 2 minutes to meld flavors. If the sauce seems too thick, add reserved pasta water a little at a time until you reach your desired consistency.
Add the cooked fettuccine to the skillet, tossing gently to coat the pasta evenly with the creamy Cajun sauce. Cook for an additional minute to let everything heat through.
Remove from heat. Sprinkle freshly chopped parsley over the top for a fresh burst of color and flavor. Serve immediately and enjoy the rich, spicy goodness of your Creamy Cajun Sausage Pasta.