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

Stir in the marinara sauce and let it simmer for about 10 minutes.

In a mixing bowl, combine the ricotta cheese, egg, Italian seasoning, salt, and pepper.

Preheat your oven to 375°F (190°C).

Spread a thin layer of meat sauce at the bottom of your baking dish.

Place three lasagna noodles on top, then spread half of the ricotta mixture, followed by a layer of meat sauce and a sprinkle of mozzarella.

Repeat this process, finishing with meat sauce and mozzarella on top.

Cover the dish with aluminum foil and bake for 25 minutes.

Remove the foil and bake for an additional 15-20 minutes until the cheese is golden and bubbly.

Let the lasagna rest for 10-15 minutes before cutting.