In a large skillet, heat olive oil over medium-high heat. Add onion, garlic, bell pepper, zucchini, eggplant, and mushrooms. Cook until vegetables are tender, about 10 minutes.
Stir in tomato sauce, Italian seasoning, salt, and black pepper. Simmer for 5 minutes.
Spread 1/2 cup of the sauce in the bottom of a 9x13 inch baking dish. Arrange 5 lasagna noodles over the sauce. Top with 1/3 of the vegetable mixture, 1/3 of the ricotta cheese, 1/3 of the mozzarella cheese, and 1/4 cup parmesan cheese. Repeat layers twice, ending with a layer of sauce. Sprinkle remaining parmesan cheese over the top.
Cover with aluminum foil and bake in preheated oven for 40 minutes. Remove foil and bake an additional 10 minutes.
Let cool for 10 minutes before serving.
Interesting Facts
Lasagna is believed to have originated in the Tuscan city of Naples in the 14th century.
This dish is a great way to get your family to eat more vegetables!