01 -
Set oven to 175°C. Lightly grease a 33x23 cm baking dish.
02 -
Boil spaghetti in generously salted water until just al dente. Drain and reserve.
03 -
In a large skillet over medium-high heat, brown ground beef. Add onion, bell pepper, Cajun seasoning, garlic powder, onion powder, and Italian seasoning. Sauté until beef is fully cooked and vegetables are softened, approximately 10 minutes.
04 -
Drain excess fat from skillet. Stir in marinara sauce. Reduce heat and simmer for 15 minutes, stirring occasionally.
05 -
In a separate large saucepan, melt butter over medium heat. Add minced garlic and sauté for 30 seconds. Pour in heavy cream, sprinkle parmesan cheese, and season with salt and pepper. Stir constantly until cheese melts and sauce is slightly thickened.
06 -
Add drained spaghetti to the alfredo sauce, tossing until all strands are evenly coated.
07 -
Spread alfredo-coated spaghetti in prepared baking dish in an even layer.
08 -
Carefully spoon meat sauce over the spaghetti layer.
09 -
Sprinkle mozzarella cheese and additional parmesan cheese evenly across the top.
10 -
Bake uncovered for 15 minutes until cheese is melted and bubbling.
11 -
Let casserole rest for 10 minutes. Garnish with dried parsley flakes if desired, then serve.