01 -
Preheat the oven to 350°F. Spray a 9x13-inch baking dish with cooking spray, and set aside. Cook spaghetti noodles according to package directions, if not already done.
02 -
In a large skillet over medium-high heat, add ground beef, onion, green bell pepper, cajun seasoning, garlic powder, onion powder, and dried Italian seasoning. Break up the beef into crumbles and cook, stirring occasionally, until the beef is no longer pink and the veggies have softened, about 10 minutes. Drain excess grease, then stir in marinara sauce and simmer on low for 15 minutes.
03 -
In a dutch oven or large stock pot, melt butter over medium heat. Add minced garlic and cook for 30 seconds until fragrant. Stir in heavy cream, shredded parmesan cheese, kosher salt, and black pepper. Cook until the cheese has melted and the sauce thickens slightly.
04 -
Add the cooked spaghetti to the alfredo sauce and stir until the noodles are evenly coated. Pour the mixture into the prepared baking dish.
05 -
Top the spaghetti mixture with the prepared meat sauce. Sprinkle mozzarella cheese and parmesan cheese over the top. Bake uncovered for 15 minutes until the cheese is melted.
06 -
Garnish with dried parsley flakes, if desired, and serve immediately.