1. Bring a large pot of salted water to a boil. Cook spaghetti until al dente. Reserve 1 cup of pasta water and drain.

2. In a cast iron skillet, heat olive oil over medium heat. Sauté onion until translucent, then add garlic and cook for 30 seconds.

3. Add ground beef and cook until browned. Drain excess fat if necessary.

4. Stir in Cajun seasoning, smoked paprika, salt, black pepper, and chili flakes. Toast the spices for 1 minute.

5. Add tomato paste, beef broth, heavy cream, and butter. Let the sauce simmer for 5–6 minutes to thicken.

6. Add the cooked spaghetti into the skillet. Toss to coat. Add a splash of pasta water if the sauce is too thick.

7. In a separate bowl, mix mozzarella, cheddar, parmesan, 1/3 cup heavy cream, garlic powder, onion powder, and black pepper.

8. Spread the cheese mixture evenly over the pasta in the skillet. Optionally sprinkle with more cheese and Cajun seasoning.

9. Broil for 5–7 minutes until the cheese is bubbly and golden.

10. Let it rest a few minutes, garnish with parsley, and serve hot.