Prepare the Meat Sauce:

• Heat a large skillet over medium heat and cook the ground beef, Italian sausage, onion, and garlic until the meat is browned and cooked through. Drain any excess fat.
• Add the crushed tomatoes, tomato paste, sugar, basil, oregano, salt, and pepper. Stir to combine and let the sauce simmer for 15-20 minutes.

Prepare the Cheese Mixture:

• In a mixing bowl, combine ricotta cheese, egg, Parmesan cheese, and 1 cup of shredded mozzarella. Add nutmeg if desired. Mix until well combined.

Assemble the Lasagna:

• Preheat your oven to 375°F (190°C).
• In a 9×13-inch baking dish, spread a thin layer of meat sauce at the bottom.
• Add a layer of lasagna noodles, followed by a layer of the cheese mixture, then a layer of meat sauce. Repeat the layers until all ingredients are used, finishing with a layer of meat sauce.
• Sprinkle the remaining 1 cup of mozzarella cheese evenly over the top.

Bake the Lasagna:

• Cover the dish with aluminum foil (to prevent sticking, spray the underside with cooking spray).
• Bake for 25 minutes, then remove the foil and bake for an additional 15-20 minutes, or until the cheese is melted and bubbly.

Rest and Serve:

• Let the lasagna rest for 10-15 minutes before slicing. Garnish with fresh parsley if desired and serve warm.