Bring a large pot of salted water to a boil.

Cook the pasta in the boiling water according to package instructions.

In a skillet, heat the olive oil over medium heat.

Add the diced onion and cook until translucent, about 3-4 minutes.

Add the minced garlic and sauté for an additional minute until fragrant.

Add the shrimp and Cajun seasoning, cooking for about 3-4 minutes until shrimp are pink and opaque.

Lower the heat and stir in the heavy cream, letting it simmer for a couple of minutes.

Stir in the grated Parmesan cheese until melted and combined.

Drain the cooked pasta and add it to the sauce, tossing everything together.

Serve hot, garnished with chopped fresh parsley.