Heat olive oil in a large skillet over medium heat. Add garlic and onion; cook until onion is tender. Stir in zucchini, red bell pepper, diced tomatoes, tomato paste, parsley, oregano, basil, salt, and pepper. Simmer for 10 minutes.
Spread 1/2 cup sauce in the bottom of a 9x13 inch baking dish.
Place 4 lasagna noodles over sauce. Spread 1/2 of the ricotta cheese over noodles. Top with 1/2 of the mozzarella cheese, and 1/2 of the remaining sauce. Repeat layering with remaining noodles, ricotta cheese, mozzarella cheese, and sauce.
Cover dish with foil. Bake in preheated oven for 30 minutes. Remove foil, and bake an additional 10 minutes, or until top is lightly browned.
Interesting Facts
Vegetable lasagna is a great way to get extra vegetables in your diet.
You can use a variety of vegetables in this recipe, such as mushrooms, spinach, or squash.
Part-skim mozzarella cheese is a great way to reduce the fat content of this dish.