Begin by preheating your oven to 350 degrees F and coating a 9"x13" pan with cooking spray.

For the sauce:

In a large pan over medium-high heat, heat oil and add ground beef and sausage. Season with salt and pepper.

Cook the meat for 3-4 minutes, breaking it into small pieces. Add onions and cook for an additional 5 minutes until the meat is browned, and onions are softened.

Add garlic and cook for 30 seconds, then introduce marinara sauce and tomato sauce. Bring the mixture to a simmer.

Allow the sauce to simmer for 5 minutes until it thickens slightly.

For assembly:

Toss the cooked rigatoni with the prepared sauce.

Pour the pasta mixture into the pan and generously top it with mozzarella cheese.

Cover and bake for 20 minutes, then uncover and bake for an additional 15-20 minutes until the pasta is bubbly, and the cheese is melted and golden brown.

Sprinkle with fresh parsley, let it stand for 5 minutes, and then serve.

Notes:

- Opt for shredding your own mozzarella to ensure proper melting, avoiding pre-shredded cheese with anti-caking agents.