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1.
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Preheat broiler.
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Lightly grease a 2-quart square baking dish; set aside.
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Trim ends off zucchini.
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Slice zucchini lengthwise into 1/8-inch-thick slices.
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Place in a single layer on a baking sheet.
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Brush with 1 teaspoon of the oil.
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Broil 3 to 4 inches from the heat about 5 minutes or until zucchini is crisp-tender, turning once.
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Cool.
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Adjust oven temperature to 375 degrees F.
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2.
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Meanwhile, for sauce: In a food processor, combine onions, carrots, and garlic.
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Cover and process until finely chopped.
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In a large saucepan, heat the remaining 3 teaspoons oil over medium-high heat.
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Add onion mixture; cook and stir about 5 minutes or until tender.
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Add marinara sauce, basil, and pepper.
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Bring to boiling; reduce heat.
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Cover and simmer for 10 minutes, stirring occasionally.
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3.
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In a small bowl, combine mozzarella cheese and Parmesan cheese.
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4.
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To assemble, arrange three of the noodles in the prepared baking dish.
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Spread with one-third of the sauce.
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Sprinkle with about 3 tablespoons of the nuts.
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Top with one-third of the zucchini and one-third of the cheese mixture.
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Repeat layering noodles, sauce, nuts, zucchini, and cheese mixture, alternating the direction of the zucchini in each layer.
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Top with the remaining noodles, remaining sauce, remaining nuts, and remaining zucchini.
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5.
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Cover dish with foil.
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Bake for 20 minutes.
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Sprinkle with the remaining cheese mixture.
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Uncover and bake about 20 minutes more or until heated through.
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Let stand for 15 minutes before serving.
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If desired, sprinkle with additional chopped walnuts.
