Begin by warming the olive oil over medium heat in a large skillet. Add the Italian sausage, diced bell peppers, chopped onion, and minced garlic. Sauté until the sausage is browned and the vegetables have softened.
Stir in the garlic herb blend, Cajun seasoning, and red pepper flakes. Continue cooking, allowing the spices to toast slightly and infuse the mixture with flavor.
Pour in the broth, followed by the heavy cream. Gradually stir in the grated Parmesan cheese, mixing until the sauce becomes smooth and fully combined.
Meanwhile, boil the cheese ravioli according to the package directions. Before draining, reserve 1/4 cup of the starchy cooking water.
Incorporate the cooked ravioli and reserved pasta water into the skillet. Gently fold everything together until the pasta is well coated in the creamy sauce.
Lower the heat and let the mixture simmer for 10 to 15 minutes, stirring occasionally, until the sauce thickens to your desired consistency. Taste and adjust the seasoning if necessary before serving immediately.