Heat olive oil in a large skillet over medium heat. Add the meatballs and cook until browned on all sides. Remove and set aside.
In the same skillet, add chopped onion and minced garlic, sauté until softened and fragrant, about three minutes.
Pour in chicken broth and bring to a simmer. Add pasta and cook according to package instructions, typically around 8-10 minutes.
Stir in heavy cream and Cajun seasoning, simmer for another 2-3 minutes until sauce thickens slightly.
Return cooked meatballs to the skillet, mix everything together, and stir in grated Parmesan cheese until melted.
Serve hot straight from the skillet.