01 -
Preheat the oven to 350°F. Spray a 9x13-inch baking dish with cooking spray, and set aside. If you haven't already, start cooking 16 ounces (1 pound) spaghetti noodles according to package directions.
02 -
In a large skillet over medium-high heat, add 1 pound ground beef, 1 small onion, finely diced, 1 green bell pepper, finely diced, 2 teaspoons cajun seasoning, 1 teaspoon garlic powder, 1 teaspoon onion powder, and 1 teaspoon dried Italian seasoning. Break up the beef into crumbles and cook, occasionally stirring, until the beef is no longer pink and the veggies have softened, about 10 minutes.
03 -
Drain any excess grease, then stir in 24 ounce jar marinara sauce and reduce the heat to low. Simmer for 15 minutes, stirring occasionally.
04 -
In a dutch oven or large stockpot, melt ½ cup unsalted butter over medium heat. Add 4 cloves garlic, minced, and cook for 30 seconds until fragrant.
05 -
Stir in 2 cups heavy cream, 2 cups shredded parmesan cheese, ½ teaspoon kosher salt, and ½ teaspoon black pepper. Cook until the cheese has melted and the sauce thickens slightly.
06 -
Add the cooked spaghetti to the alfredo sauce and stir until the noodles are coated in the sauce. Pour this mixture into the prepared baking dish.
07 -
Top the pasta mixture with the meat sauce.
08 -
Sprinkle 2 cups shredded mozzarella cheese and 2 tablespoons shredded parmesan cheese over the top. Bake uncovered for 15 minutes, until the cheese is melted.
09 -
Garnish with 2 teaspoons dried parsley flakes (optional) and serve immediately.