Create the sauce by stirring in crushed tomatoes, tomato paste, oregano, basil, salt, and pepper. Simmer for 20 minutes.
Prepare the cheese mixture in a bowl by combining ricotta, egg, Parmesan, and parsley until smooth.
Cook the lasagna noodles according to package instructions until al dente, then drain and rinse.
Assemble the lasagna by spreading a thin layer of meat sauce in a 9×13 inch baking dish, layering noodles, ricotta, mozzarella, and meat sauce, finishing with noodles and mozzarella on top.
Bake covered for 25 minutes, then uncover and bake for an additional 15 minutes, until cheese is bubbly.
Rest for 15 minutes before slicing and serving.
Notes
Let the lasagna rest before slicing for better presentation. Can be made in advance and stored in the fridge.