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Preheat oven to 375°Brush 2 baking sheets with oil; set aside.
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In a wide, shallow bowl, whisk together eggs and 2 tablespoons water.
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In another bowl, combine breadcrumbs, 3/4 cup Parmesan, oregano, and basil; season with salt and pepper.
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Dip eggplant slices in egg mixture, letting excess drip off, then dredge in breadcrumb mixture, coating well; place on baking sheets.
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Bake until golden brown on bottom, 20 to 25 minutes.
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Turn slices; continue baking until browned on other side, 20 to 25 minutes more. Remove from oven; raise oven heat to 400°F.
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Spread 2 cups sauce in a 9-by-13-inch baking dish.
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Arrange half the eggplant in dish; cover with 2 cups sauce, then 1/2 cup mozzarella.
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Repeat with remaining eggplant, sauce, and mozzarella; sprinkle with remaining 2 tablespoons Parmesan.
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Bake until sauce is bubbling and cheese is melted, 15 to 20 minutes.
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Let stand 5 minutes before serving.