Cook pasta in salted water until al dente and reserve 1/2 cup pasta water before draining.
Heat olive oil in a large skillet and brown sausage slices 3–4 minutes, then remove.
In the same skillet, sauté onion, garlic, and bell pepper 3–4 minutes until softened.
Stir in Cajun seasoning and smoked paprika.
Pour in heavy cream and chicken broth and simmer 3–4 minutes until slightly thickened.
Stir in parmesan until smooth.
Add cooked pasta and sausage back to the skillet and toss to coat evenly.
Add a splash of reserved pasta water if needed and garnish with parsley before serving.