In a large pot of salted boiling water, cook the fettuccine according to package instructions until al dente. Drain and set aside.
In a large skillet, heat the olive oil over medium heat. Add the sliced turkey sausage and cook until browned, about 5-7 minutes. Remove the sausage from the skillet and set aside.
In the same skillet, add the diced onion and sauté for 3-4 minutes until translucent. Add in the garlic, red bell pepper, and green bell pepper, and cook for another 5 minutes until the peppers are tender.
Stir in the heavy cream and chicken broth to the vegetables. Add Cajun seasoning, salt, and pepper to taste. Bring the mixture to a simmer and cook for 5 minutes until slightly thickened.
Return the cooked turkey sausage to the skillet, and fold in the cherry tomatoes. Cook for another 2-3 minutes until everything is heated through.
Add the drained fettuccine to the sauce, tossing to combine and coat the pasta evenly. Allow it to cook for an additional minute on low heat so the flavors meld together.
Stir in the grated Parmesan cheese until melted and creamy. Remove from heat and garnish with fresh parsley before serving.