Bring a large pot of salted water to a rolling boil. Add spaghetti and cook according to package instructions until al dente, about 8-10 minutes. Drain and drizzle with olive oil.

In a large skillet, heat olive oil over medium heat. Sauté chopped onion for about 3 minutes until translucent. Add minced garlic and cook for 30 seconds until fragrant.

Add ground beef to the skillet and break it apart. Cook for 5-7 minutes until browned and drain excess fat.

Sprinkle Cajun seasoning, smoked paprika, crushed red pepper, salt, and pepper over the beef and cook for 1-2 minutes.

Pour in tomato sauce and beef broth, stirring well. Bring to a gentle simmer for about 5-7 minutes.

Gently stir in the cooked spaghetti, ensuring all strands are well-coated. Toss with tongs to distribute the beef and sauce evenly.

Divide among plates, garnish with parsley and grated Parmesan. Serve hot and enjoy!