Preheat oven to 375°F (190°C). Cook lasagna noodles according to package instructions. Drain and set aside.
In a large skillet, cook ground beef and sausage over medium heat until browned. Add onion and garlic; sauté until fragrant.
Stir in crushed tomatoes, tomato paste, basil, oregano, salt, and pepper. Simmer for 20 minutes, stirring occasionally.
In a bowl, combine ricotta cheese with egg. Mix well.
Spread 1/2 cup meat sauce in the bottom of a 9x13-inch baking dish. Layer 3 noodles over sauce. Spread 1/3 of the ricotta mixture, 1/3 of the meat sauce, and sprinkle with mozzarella. Repeat layers twice, ending with sauce and remaining mozzarella and Parmesan on top.
Cover with foil (to prevent sticking, spray foil with cooking spray). Bake for 25 minutes. Remove foil and bake an additional 20 minutes or until cheese is bubbly and golden.
Let rest for 15 minutes before slicing. Garnish with fresh parsley if desired. Enjoy!