In a large frying pan, cook the ground beef and Italian sausage over medium heat until browned.

Add the chopped onion and minced garlic to the meat mixture, cooking until the onion is soft.

Stir in the crushed tomatoes, tomato paste, basil, oregano, salt, and pepper. Simmer for about 20 minutes.

In a mixing bowl, combine the ricotta cheese, egg, Parmesan cheese, and parsley.

Boil the lasagna noodles according to package instructions until al dente.

Spread a thin layer of meat sauce on the bottom of a 9x13 inch baking dish. Layer with noodles, cheese mixture, and more sauce, repeating until all ingredients are used.

Finish by layering shredded mozzarella cheese on top of the final sauce layer.

Cover the baking dish with aluminum foil and bake at 375°F for 25 minutes.

Remove the foil and bake for an additional 20 minutes until bubbly and golden.

Let the lasagna sit for 10-15 minutes before slicing.