Preheat the oven to 375°F (190°C).
Cook the lasagna noodles according to the package instructions, and then drain them and rinse them with cold water to prevent them from sticking together.
In a mixing bowl, combine the ricotta cheese, parmesan cheese, egg, salt, and pepper.
Spread a thin layer of marinara sauce on the bottom of a 9x13 inch baking dish.
Place a layer of lasagna noodles on top of the marinara sauce, followed by a layer of sliced vegetables.
Spoon half of the ricotta cheese mixture on top of the vegetables, and then sprinkle with one-third of the shredded mozzarella cheese.
Repeat layers, starting with marinara sauce, followed by noodles, vegetables, ricotta mixture, and mozzarella cheese.
Cover the baking dish with foil and bake for 25 minutes.
Remove the foil and bake for an additional 25 minutes, or until the cheese is melted and bubbly.
Let the lasagna cool for a few minutes before serving.