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

In a skillet over medium heat, add the sliced Cajun sausage. Cook until browned, about 5-7 minutes.

Add the chopped onion and sliced bell peppers to the skillet with the sausage. Sauté for about 5 minutes until the vegetables are tender. Stir in the minced garlic and cook for an additional minute.

Pour in the heavy cream and chicken broth. Stir in the Cajun seasoning, salt, and black pepper. Bring to a simmer and cook for 5 minutes until slightly thickened.

Add the cooked pasta to the skillet and toss to coat in the sauce. Cook for an additional 2 minutes to heat through. Garnish with chopped parsley before serving.