Bring a large pot of salted water to a boil and cook the penne pasta according to package instructions. Drain and set aside.

In a large skillet, heat olive oil over medium heat. Add the sliced smoked sausage and cook until browned, about 3-4 minutes per side. Remove from the skillet and set aside.

Add the diced onion and red bell pepper to the same skillet. Sauté until softened, about 5 minutes.

Stir in the minced garlic, Cajun seasoning, paprika, and cayenne pepper. Cook for 1 minute, until fragrant.

Pour in the heavy cream and chicken broth, stirring to combine. Bring the mixture to a simmer and cook for 3-4 minutes to slightly thicken.

Add the grated Parmesan cheese and stir until melted and smooth. Season with salt and black pepper to taste.

Return the cooked sausage to the skillet and stir to coat in the sauce.

Add the cooked pasta to the skillet and toss to combine, ensuring the pasta is evenly coated in the creamy sauce.

Remove from heat and garnish with sliced green onions.

Serve immediately and enjoy!