Heat olive oil in a large skillet over medium heat. Add the meatballs and cook until browned on all sides, about 5-7 minutes. Remove from skillet and set aside.
In the same skillet, add chopped onion and minced garlic. Sauté for about 3 minutes until softened and fragrant.
Pour in chicken broth and bring to a simmer. Add pasta and cook according to package instructions, usually around 8-10 minutes until al dente.
Stir in heavy cream and Cajun seasoning, mixing well. Allow to simmer for another 2-3 minutes until sauce thickens slightly.
Return cooked meatballs to the skillet and mix everything together. Stir in grated Parmesan cheese and season with salt and pepper.
Serve hot from the stove for a rich meal.