Bring a large pot of salted water to a boil and cook the penne pasta according to package instructions until al dente. Drain and set aside.
In a large skillet over medium heat, add olive oil. Once hot, add the spicy Italian sausage and cook, breaking it apart with a spatula, until browned (about 5-7 minutes).
Add the diced onion, bell pepper, and minced garlic to the skillet. Sauté for another 5-7 minutes until the vegetables are tender and the onion is translucent.
Pour the undrained diced tomatoes into the skillet, followed by the heavy cream, Cajun seasoning, smoked paprika, salt, and pepper. Stir well and let simmer for 5 minutes until slightly thickened.
Add the cooked penne pasta to the skillet, tossing to combine until the pasta is evenly coated with the sauce. Cook for an additional 2-3 minutes to heat through.
Remove from heat and stir in the grated Parmesan cheese until melted and well incorporated.
Serve hot, garnished with chopped fresh parsley for a pop of color.
Notes
Serve hot and garnish with fresh parsley for added color.